23311112021 has 16 divisors (see below), whose sum is σ = 24312150000. Its totient is φ = 22323979776.

The previous prime is 23311112009. The next prime is 23311112039. The reversal of 23311112021 is 12021111332.

It can be written as a sum of positive squares in 8 ways, for example, as 45711121 + 23265400900 = 6761^2 + 152530^2 .

It is a cyclic number.

It is not a de Polignac number, because 23311112021 - 2²⁶ = 23244003157 is a prime.

It is a super-2 number, since 2×23311112021² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23311112081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1779905 + ... + 1792953.

It is an arithmetic number, because the mean of its divisors is an integer number (1519509375).

Almost surely, 2^23311112021 is an apocalyptic number.

It is an amenable number.

23311112021 is a deficient number, since it is larger than the sum of its proper divisors (1001037979).

23311112021 is a wasteful number, since it uses less digits than its factorization.

23311112021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13576.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 23311112021 its reverse (12021111332), we get a palindrome (35332223353).

The spelling of 23311112021 in words is "twenty-three billion, three hundred eleven million, one hundred twelve thousand, twenty-one".