21601254416 has 40 divisors (see below), whose sum is σ = 47838307200. Its totient is φ = 9256333824.

The previous prime is 21601254373. The next prime is 21601254431. The reversal of 21601254416 is 61445210612.

It is a super-2 number, since 2×21601254416² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1341485 + ... + 1357491.

It is an arithmetic number, because the mean of its divisors is an integer number (1195957680).

Almost surely, 2^21601254416 is an apocalyptic number.

It is an amenable number.

21601254416 is an abundant number, since it is smaller than the sum of its proper divisors (26237052784).

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

21601254416 is a wasteful number, since it uses less digits than its factorization.

21601254416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28071 (or 28065 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The spelling of 21601254416 in words is "twenty-one billion, six hundred one million, two hundred fifty-four thousand, four hundred sixteen".