2120001111 has 6 divisors (see below), whose sum is σ = 3062223840. Its totient is φ = 1413334068.

The previous prime is 2120001109. The next prime is 2120001131. The reversal of 2120001111 is 1111000212.

It is a happy number.

It is not a de Polignac number, because 2120001111 - 2¹ = 2120001109 is a prime.

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: 235555679 = 2120001111 / (2 + 1 + 2 + 0 + 0 + 0 + 1 + 1 + 1 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 2120001093 and 2120001102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120001131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 117777831 + ... + 117777848.

It is an arithmetic number, because the mean of its divisors is an integer number (510370640).

Almost surely, 2^2120001111 is an apocalyptic number.

2120001111 is a deficient number, since it is larger than the sum of its proper divisors (942222729).

2120001111 is a wasteful number, since it uses less digits than its factorization.

2120001111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235555685 (or 235555682 counting only the distinct ones).

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

The square root of 2120001111 is about 46043.4697975728. The cubic root of 2120001111 is about 1284.6318821190.

Adding to 2120001111 its reverse (1111000212), we get a palindrome (3231001323).

The spelling of 2120001111 in words is "two billion, one hundred twenty million, one thousand, one hundred eleven".