1621928151980 has 96 divisors (see below), whose sum is σ = 3474425949120. Its totient is φ = 635895152640.

The previous prime is 1621928151947. The next prime is 1621928152021. The reversal of 1621928151980 is 891518291261.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 115178540 + ... + 115192620.

It is an arithmetic number, because the mean of its divisors is an integer number (36191936970).

Almost surely, 2^{1621928151980} is an apocalyptic number.

1621928151980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1621928151980 is an abundant number, since it is smaller than the sum of its proper divisors (1852497797140).

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

1621928151980 is a wasteful number, since it uses less digits than its factorization.

1621928151980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14739 (or 14737 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 53.

The spelling of 1621928151980 in words is "one trillion, six hundred twenty-one billion, nine hundred twenty-eight million, one hundred fifty-one thousand, nine hundred eighty".