21621337447632 has 80 divisors (see below), whose sum is σ = 60152327796288. Its totient is φ = 6652646415360.

The previous prime is 21621337447613. The next prime is 21621337447673. The reversal of 21621337447632 is 23674473312612.

It is a super-3 number, since 3×21621337447632³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

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, 95759223 + ... + 95984745.

Almost surely, 2^{21621337447632} is an apocalyptic number.

It is an amenable number.

21621337447632 is an abundant number, since it is smaller than the sum of its proper divisors (38530990348656).

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

21621337447632 is a wasteful number, since it uses less digits than its factorization.

21621337447632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379188 (or 379182 counting only the distinct ones).

The product of its digits is 6096384, while the sum is 51.

The spelling of 21621337447632 in words is "twenty-one trillion, six hundred twenty-one billion, three hundred thirty-seven million, four hundred forty-seven thousand, six hundred thirty-two".