21412651980 has 48 divisors (see below), whose sum is σ = 61231080960. Its totient is φ = 5588549568.

The previous prime is 21412651973. The next prime is 21412652011. The reversal of 21412651980 is 8915621412.

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, 3793750 + ... + 3799389.

It is an arithmetic number, because the mean of its divisors is an integer number (1275647520).

Almost surely, 2^21412651980 is an apocalyptic number.

21412651980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21412651980 is an abundant number, since it is smaller than the sum of its proper divisors (39818428980).

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

21412651980 is a wasteful number, since it uses less digits than its factorization.

21412651980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7593198 (or 7593196 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 39.

The spelling of 21412651980 in words is "twenty-one billion, four hundred twelve million, six hundred fifty-one thousand, nine hundred eighty".