21599648420560 has 160 divisors (see below), whose sum is σ = 61110935078400. Its totient is φ = 7083611200512.

The previous prime is 21599648420551. The next prime is 21599648420617. The reversal of 21599648420560 is 6502484699512.

It is a Smith number, since the sum of its digits (61) coincides with the sum of the digits of its prime factors.

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, 16481037 + ... + 17743276.

It is an arithmetic number, because the mean of its divisors is an integer number (381943344240).

Almost surely, 2^{21599648420560} is an apocalyptic number.

21599648420560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21599648420560 is an abundant number, since it is smaller than the sum of its proper divisors (39511286657840).

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

21599648420560 is a wasteful number, since it uses less digits than its factorization.

21599648420560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34224370 (or 34224350 counting only the distinct ones).

The product of its (nonzero) digits is 37324800, while the sum is 61.

The spelling of 21599648420560 in words is "twenty-one trillion, five hundred ninety-nine billion, six hundred forty-eight million, four hundred twenty thousand, five hundred sixty".