21601625007460 has 96 divisors (see below), whose sum is σ = 45888100473600. Its totient is φ = 8541108011520.

The previous prime is 21601625007451. The next prime is 21601625007467. The reversal of 21601625007460 is 6470052610612.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21601625007467) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1935797361 + ... + 1935808519.

It is an arithmetic number, because the mean of its divisors is an integer number (478001046600).

Almost surely, 2^{21601625007460} is an apocalyptic number.

21601625007460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21601625007460 is an abundant number, since it is smaller than the sum of its proper divisors (24286475466140).

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

21601625007460 is a wasteful number, since it uses less digits than its factorization.

21601625007460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13301 (or 13299 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 40.

The spelling of 21601625007460 in words is "twenty-one trillion, six hundred one billion, six hundred twenty-five million, seven thousand, four hundred sixty".