21321049563072 has 448 divisors, whose sum is σ = 73747915699200. Its totient is φ = 5988462575616.

The previous prime is 21321049563041. The next prime is 21321049563097. The reversal of 21321049563072 is 27036594012312.

It is a happy number.

21321049563072 is a `hidden beast` number, since 2 + 1 + 3 + 2 + 1 + 0 + 4 + 9 + 5 + 630 + 7 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (448).

It is a congruent number.

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, 57622368 + ... + 57991200.

Almost surely, 2^{21321049563072} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21321049563072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36873957849600).

21321049563072 is an abundant number, since it is smaller than the sum of its proper divisors (52426866136128).

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

21321049563072 is an frugal number, since it uses more digits than its factorization.

21321049563072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368932 (or 368904 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

The spelling of 21321049563072 in words is "twenty-one trillion, three hundred twenty-one billion, forty-nine million, five hundred sixty-three thousand, seventy-two".