21616604622444 has 48 divisors (see below), whose sum is σ = 55643492590560. Its totient is φ = 6489037032960.

The previous prime is 21616604622373. The next prime is 21616604622451. The reversal of 21616604622444 is 44422640661612.

It is a junction number, because it is equal to n+sod(n) for n = 21616604622393 and 21616604622402.

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, 1689846999 + ... + 1689859790.

It is an arithmetic number, because the mean of its divisors is an integer number (1159239428970).

Almost surely, 2^{21616604622444} is an apocalyptic number.

It is an amenable number.

21616604622444 is an abundant number, since it is smaller than the sum of its proper divisors (34026887968116).

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

21616604622444 is a wasteful number, since it uses less digits than its factorization.

21616604622444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3379706850 (or 3379706848 counting only the distinct ones).

The product of its (nonzero) digits is 2654208, while the sum is 48.

The spelling of 21616604622444 in words is "twenty-one trillion, six hundred sixteen billion, six hundred four million, six hundred twenty-two thousand, four hundred forty-four".