21312111023 has 8 divisors (see below), whose sum is σ = 24463061280. Its totient is φ = 18187751520.

The previous prime is 21312110993. The next prime is 21312111077. The reversal of 21312111023 is 32011121312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21312111023 - 2⁸ = 21312110767 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21312110992 and 21312111010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21312111323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6645968 + ... + 6649173.

It is an arithmetic number, because the mean of its divisors is an integer number (3057882660).

Almost surely, 2^21312111023 is an apocalyptic number.

21312111023 is a deficient number, since it is larger than the sum of its proper divisors (3150950257).

21312111023 is a wasteful number, since it uses less digits than its factorization.

21312111023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13295377.

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

Adding to 21312111023 its reverse (32011121312), we get a palindrome (53323232335).

The spelling of 21312111023 in words is "twenty-one billion, three hundred twelve million, one hundred eleven thousand, twenty-three".