21616220455404 has 12 divisors (see below), whose sum is σ = 50437847729304. Its totient is φ = 7205406818464.

The previous prime is 21616220455387. The next prime is 21616220455411. The reversal of 21616220455404 is 40455402261612.

It is a tau number, because it is divible by the number of its divisors (12).

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, 900675852297 + ... + 900675852320.

It is an arithmetic number, because the mean of its divisors is an integer number (4203153977442).

Almost surely, 2^{21616220455404} is an apocalyptic number.

It is an amenable number.

21616220455404 is an abundant number, since it is smaller than the sum of its proper divisors (28821627273900).

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

21616220455404 is a wasteful number, since it uses less digits than its factorization.

21616220455404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1801351704624 (or 1801351704622 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 42.

The spelling of 21616220455404 in words is "twenty-one trillion, six hundred sixteen billion, two hundred twenty million, four hundred fifty-five thousand, four hundred four".