21230932731 has 16 divisors (see below), whose sum is σ = 29341714944. Its totient is φ = 13646042784.

The previous prime is 21230932727. The next prime is 21230932733. The reversal of 21230932731 is 13723903212.

It is not a de Polignac number, because 21230932731 - 2² = 21230932727 is a prime.

It is a super-2 number, since 2×21230932731² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21230932692 and 21230932701.

It is not an unprimeable number, because it can be changed into a prime (21230932733) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1114240 + ... + 1133133.

It is an arithmetic number, because the mean of its divisors is an integer number (1833857184).

Almost surely, 2^21230932731 is an apocalyptic number.

21230932731 is a deficient number, since it is larger than the sum of its proper divisors (8110782213).

21230932731 is a wasteful number, since it uses less digits than its factorization.

21230932731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2247490.

The product of its (nonzero) digits is 13608, while the sum is 33.

The spelling of 21230932731 in words is "twenty-one billion, two hundred thirty million, nine hundred thirty-two thousand, seven hundred thirty-one".