21655160416 has 12 divisors (see below), whose sum is σ = 42633597132. Its totient is φ = 10827580192.

The previous prime is 21655160407. The next prime is 21655160431. The reversal of 21655160416 is 61406155612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 338361850 + ... + 338361913.

It is an arithmetic number, because the mean of its divisors is an integer number (3552799761).

Almost surely, 2^21655160416 is an apocalyptic number.

It is an amenable number.

21655160416 is a deficient number, since it is larger than the sum of its proper divisors (20978436716).

21655160416 is an equidigital number, since it uses as much as digits as its factorization.

21655160416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 676723773 (or 676723765 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 37.

The spelling of 21655160416 in words is "twenty-one billion, six hundred fifty-five million, one hundred sixty thousand, four hundred sixteen".