23513112021 has 32 divisors (see below), whose sum is σ = 36696064000. Its totient is φ = 13386325680.

The previous prime is 23513112011. The next prime is 23513112067. The reversal of 23513112021 is 12021131532.

It is not a de Polignac number, because 23513112021 - 2⁹ = 23513111509 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23513112011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 236700 + ... + 321018.

It is an arithmetic number, because the mean of its divisors is an integer number (1146752000).

Almost surely, 2^23513112021 is an apocalyptic number.

23513112021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

23513112021 is a deficient number, since it is larger than the sum of its proper divisors (13182951979).

23513112021 is an equidigital number, since it uses as much as digits as its factorization.

23513112021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84614 (or 84600 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

Adding to 23513112021 its reverse (12021131532), we get a palindrome (35534243553).

The spelling of 23513112021 in words is "twenty-three billion, five hundred thirteen million, one hundred twelve thousand, twenty-one".