21425353180 has 96 divisors (see below), whose sum is σ = 56126794752. Its totient is φ = 6674304000.

The previous prime is 21425353129. The next prime is 21425353193. The reversal of 21425353180 is 8135352412.

It is a super-2 number, since 2×21425353180² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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, 4311057 + ... + 4316023.

It is an arithmetic number, because the mean of its divisors is an integer number (584654112).

Almost surely, 2^21425353180 is an apocalyptic number.

21425353180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21425353180, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28063397376).

21425353180 is an abundant number, since it is smaller than the sum of its proper divisors (34701441572).

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

21425353180 is a wasteful number, since it uses less digits than its factorization.

21425353180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7795 (or 7793 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 34.

The spelling of 21425353180 in words is "twenty-one billion, four hundred twenty-five million, three hundred fifty-three thousand, one hundred eighty".