21002203131020 has 24 divisors (see below), whose sum is σ = 44636007621744. Its totient is φ = 8299665814976.

The previous prime is 21002203130977. The next prime is 21002203131023. The reversal of 21002203131020 is 2013130220012.

It is a self number, because there is not a number n which added to its sum of digits gives 21002203131020.

It is not an unprimeable number, because it can be changed into a prime (21002203131023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6325963139 + ... + 6325966458.

It is an arithmetic number, because the mean of its divisors is an integer number (1859833650906).

Almost surely, 2^{21002203131020} is an apocalyptic number.

21002203131020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21002203131020 is an abundant number, since it is smaller than the sum of its proper divisors (23633804490724).

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

21002203131020 is a wasteful number, since it uses less digits than its factorization.

21002203131020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12651929689 (or 12651929687 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21002203131020 its reverse (2013130220012), we get a palindrome (23015333351032).

The spelling of 21002203131020 in words is "twenty-one trillion, two billion, two hundred three million, one hundred thirty-one thousand, twenty".