21532554120 has 384 divisors, whose sum is σ = 84627763200. Its totient is φ = 4329561600.

The previous prime is 21532554097. The next prime is 21532554149. The reversal of 21532554120 is 2145523512.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1999711 + ... + 2010449.

It is an arithmetic number, because the mean of its divisors is an integer number (220384800).

Almost surely, 2^21532554120 is an apocalyptic number.

21532554120 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 21532554120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42313881600).

21532554120 is an abundant number, since it is smaller than the sum of its proper divisors (63095209080).

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

21532554120 is a wasteful number, since it uses less digits than its factorization.

21532554120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10809 (or 10798 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

The spelling of 21532554120 in words is "twenty-one billion, five hundred thirty-two million, five hundred fifty-four thousand, one hundred twenty".