21312311023 has 8 divisors (see below), whose sum is σ = 21583117088. Its totient is φ = 21042733824.

The previous prime is 21312311011. The next prime is 21312311093. The reversal of 21312311023 is 32011321312.

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 21312311023 - 2²⁵ = 21278756591 is a prime.

It is a super-2 number, since 2×21312311023² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21312311093) 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 7 ways as a sum of consecutive naturals, for example, 272286 + ... + 341707.

It is an arithmetic number, because the mean of its divisors is an integer number (2697889636).

Almost surely, 2^21312311023 is an apocalyptic number.

21312311023 is a deficient number, since it is larger than the sum of its proper divisors (270806065).

21312311023 is a wasteful number, since it uses less digits than its factorization.

21312311023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 614433.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21312311023 its reverse (32011321312), we get a palindrome (53323632335).

The spelling of 21312311023 in words is "twenty-one billion, three hundred twelve million, three hundred eleven thousand, twenty-three".