21310331020 has 48 divisors (see below), whose sum is σ = 49143419136. Its totient is φ = 7697880000.

The previous prime is 21310331017. The next prime is 21310331027. The reversal of 21310331020 is 2013301312.

It is a junction number, because it is equal to n+sod(n) for n = 21310330985 and 21310331003.

It is not an unprimeable number, because it can be changed into a prime (21310331027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 287526 + ... + 353965.

It is an arithmetic number, because the mean of its divisors is an integer number (1023821232).

Almost surely, 2^21310331020 is an apocalyptic number.

21310331020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21310331020 is an abundant number, since it is smaller than the sum of its proper divisors (27833088116).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21310331020 is a wasteful number, since it uses less digits than its factorization.

21310331020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641662 (or 641660 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21310331020 its reverse (2013301312), we get a palindrome (23323632332).

The spelling of 21310331020 in words is "twenty-one billion, three hundred ten million, three hundred thirty-one thousand, twenty".