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2121111 = 32235679
BaseRepresentation
bin1000000101110110010111
310222202121200
420011312113
51020333421
6113243543
724012666
oct10056627
93882550
102121111
111219693
128635b3
135935c5
143d2ddd
152bd726
hex205d97

2121111 has 6 divisors (see below), whose sum is σ = 3063840. Its totient is φ = 1414068.

The previous prime is 2121043. The next prime is 2121121. The reversal of 2121111 is 1111212.

It is a happy number.

2121111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2121111 - 213 = 2112919 is a prime.

It is a super-2 number, since 2×21211112 = 8998223748642, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 235679 = 2121111 / (2 + 1 + 2 + 1 + 1 + 1 + 1).

2121111 is a modest number, since divided by 1111 gives 212 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 2121093 and 2121102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 117831 + ... + 117848.

It is an arithmetic number, because the mean of its divisors is an integer number (510640).

22121111 is an apocalyptic number.

2121111 is a deficient number, since it is larger than the sum of its proper divisors (942729).

2121111 is a wasteful number, since it uses less digits than its factorization.

2121111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235685 (or 235682 counting only the distinct ones).

The product of its digits is 4, while the sum is 9.

The square root of 2121111 is about 1456.4034468512. The cubic root of 2121111 is about 128.4856025091.

Adding to 2121111 its reverse (1111212), we get a palindrome (3232323).

It can be divided in two parts, 212 and 1111, that multiplied together give a palindrome (235532).

The spelling of 2121111 in words is "two million, one hundred twenty-one thousand, one hundred eleven".

Divisors: 1 3 9 235679 707037 2121111