21302312031 has 96 divisors (see below), whose sum is σ = 42430821888. Its totient is φ = 9938661120.

The previous prime is 21302312021. The next prime is 21302312033. The reversal of 21302312031 is 13021320312.

21302312031 is a `hidden beast` number, since 21 + 302 + 312 + 0 + 31 = 666.

It is not a de Polignac number, because 21302312031 - 2⁵ = 21302311999 is a prime.

It is a super-2 number, since 2×21302312031² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21302311995 and 21302312013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21302312033) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 301380 + ... + 365286.

It is an arithmetic number, because the mean of its divisors is an integer number (441987728).

Almost surely, 2^21302312031 is an apocalyptic number.

21302312031 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21302312031 is a deficient number, since it is larger than the sum of its proper divisors (21128509857).

21302312031 is a wasteful number, since it uses less digits than its factorization.

21302312031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63981 (or 63978 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21302312031 its reverse (13021320312), we get a palindrome (34323632343).

It can be divided in two parts, 21302 and 312031, that added together give a palindrome (333333).

The spelling of 21302312031 in words is "twenty-one billion, three hundred two million, three hundred twelve thousand, thirty-one".