21310233021 has 96 divisors (see below), whose sum is σ = 39581208576. Its totient is φ = 10726560000.

The previous prime is 21310233019. The next prime is 21310233041. The reversal of 21310233021 is 12033201312.

21310233021 is a `hidden beast` number, since 2 + 1 + 310 + 2 + 330 + 21 = 666.

It is not a de Polignac number, because 21310233021 - 2¹ = 21310233019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21310232985 and 21310233003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21310233041) 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 95 ways as a sum of consecutive naturals, for example, 4287880 + ... + 4292846.

It is an arithmetic number, because the mean of its divisors is an integer number (412304256).

Almost surely, 2^21310233021 is an apocalyptic number.

21310233021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21310233021 is a deficient number, since it is larger than the sum of its proper divisors (18270975555).

21310233021 is a wasteful number, since it uses less digits than its factorization.

21310233021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5183 (or 5180 counting only the distinct ones).

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

Adding to 21310233021 its reverse (12033201312), we get a palindrome (33343434333).

The spelling of 21310233021 in words is "twenty-one billion, three hundred ten million, two hundred thirty-three thousand, twenty-one".