1021987162920 has 64 divisors (see below), whose sum is σ = 3068307760320. Its totient is φ = 272321352704.

The previous prime is 1021987162919. The next prime is 1021987162949. The reversal of 1021987162920 is 292617891201.

It is a happy number.

It is a super-2 number, since 2×1021987162920² (a number of 25 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1021987162920.

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, 3101217 + ... + 3414896.

It is an arithmetic number, because the mean of its divisors is an integer number (47942308755).

Almost surely, 2^{1021987162920} is an apocalyptic number.

1021987162920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021987162920 is an abundant number, since it is smaller than the sum of its proper divisors (2046320597400).

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

1021987162920 is a wasteful number, since it uses less digits than its factorization.

1021987162920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6517434 (or 6517430 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 48.

The spelling of 1021987162920 in words is "one trillion, twenty-one billion, nine hundred eighty-seven million, one hundred sixty-two thousand, nine hundred twenty".