21015651180832 has 384 divisors, whose sum is σ = 54091633655808. Its totient is φ = 7793470080000.

The previous prime is 21015651180803. The next prime is 21015651180841. The reversal of 21015651180832 is 23808115651012.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 14768552473 + ... + 14768553895.

It is an arithmetic number, because the mean of its divisors is an integer number (140863629312).

Almost surely, 2^{21015651180832} is an apocalyptic number.

21015651180832 is a gapful number since it is divisible by the number (22) 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 21015651180832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27045816827904).

21015651180832 is an abundant number, since it is smaller than the sum of its proper divisors (33075982474976).

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

21015651180832 is a wasteful number, since it uses less digits than its factorization.

21015651180832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2572 (or 2564 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 43.

The spelling of 21015651180832 in words is "twenty-one trillion, fifteen billion, six hundred fifty-one million, one hundred eighty thousand, eight hundred thirty-two".