21310303020 has 48 divisors (see below), whose sum is σ = 59799491808. Its totient is φ = 5670305280.

The previous prime is 21310302977. The next prime is 21310303051. The reversal of 21310303020 is 2030301312.

It is a super-2 number, since 2×21310303020² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 361171 + ... + 416010.

It is an arithmetic number, because the mean of its divisors is an integer number (1245822746).

Almost surely, 2^21310303020 is an apocalyptic number.

21310303020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21310303020 is an abundant number, since it is smaller than the sum of its proper divisors (38489188788).

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

21310303020 is a wasteful number, since it uses less digits than its factorization.

21310303020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 777650 (or 777648 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 15.

Adding to 21310303020 its reverse (2030301312), we get a palindrome (23340604332).

The spelling of 21310303020 in words is "twenty-one billion, three hundred ten million, three hundred three thousand, twenty".