21655235561416 has 16 divisors (see below), whose sum is σ = 40714203104640. Its totient is φ = 10798114733520.

The previous prime is 21655235561357. The next prime is 21655235561461. The reversal of 21655235561416 is 61416553255612.

It is a super-2 number, since 2×21655235561416² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3687877780 + ... + 3687883651.

It is an arithmetic number, because the mean of its divisors is an integer number (2544637694040).

Almost surely, 2^{21655235561416} is an apocalyptic number.

It is an amenable number.

21655235561416 is a deficient number, since it is larger than the sum of its proper divisors (19058967543224).

21655235561416 is a wasteful number, since it uses less digits than its factorization.

21655235561416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7375761804 (or 7375761800 counting only the distinct ones).

The product of its digits is 6480000, while the sum is 52.

The spelling of 21655235561416 in words is "twenty-one trillion, six hundred fifty-five billion, two hundred thirty-five million, five hundred sixty-one thousand, four hundred sixteen".