21323311031 has 6 divisors (see below), whose sum is σ = 23438019696. Its totient is φ = 19384828100.

The previous prime is 21323311027. The next prime is 21323311103. The reversal of 21323311031 is 13011332312.

It is not a de Polignac number, because 21323311031 - 2² = 21323311027 is a prime.

It is a super-2 number, since 2×21323311031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21323310994 and 21323311012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323311001) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 88112735 + ... + 88112976.

It is an arithmetic number, because the mean of its divisors is an integer number (3906336616).

Almost surely, 2^21323311031 is an apocalyptic number.

21323311031 is a deficient number, since it is larger than the sum of its proper divisors (2114708665).

21323311031 is a wasteful number, since it uses less digits than its factorization.

21323311031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176225733 (or 176225722 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 21323311031 its reverse (13011332312), we get a palindrome (34334643343).

The spelling of 21323311031 in words is "twenty-one billion, three hundred twenty-three million, three hundred eleven thousand, thirty-one".