2121101 has 4 divisors (see below), whose sum is σ = 2142204. Its totient is φ = 2100000.

The previous prime is 2121043. The next prime is 2121121. The reversal of 2121101 is 1011212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1357225 + 763876 = 1165^2 + 874^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121101 - 2¹⁴ = 2104717 is a prime.

It is a Duffinian number.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10400 + ... + 10601.

It is an arithmetic number, because the mean of its divisors is an integer number (535551).

2^2121101 is an apocalyptic number.

It is an amenable number.

2121101 is a deficient number, since it is larger than the sum of its proper divisors (21103).

2121101 is a wasteful number, since it uses less digits than its factorization.

2121101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21102.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 2121101 is about 1456.4000137325. The cubic root of 2121101 is about 128.4854005932.

Adding to 2121101 its reverse (1011212), we get a palindrome (3132313).

It can be divided in two parts, 2121 and 101, that added together give a palindrome (2222).

The spelling of 2121101 in words is "two million, one hundred twenty-one thousand, one hundred one".