21616220411401 has 24 divisors (see below), whose sum is σ = 27190807926912. Its totient is φ = 16821137625600.

The previous prime is 21616220411351. The next prime is 21616220411453. The reversal of 21616220411401 is 10411402261612.

It is not a de Polignac number, because 21616220411401 - 2²⁷ = 21616086193673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21616220421401) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16544920 + ... + 17803561.

It is an arithmetic number, because the mean of its divisors is an integer number (1132950330288).

Almost surely, 2^{21616220411401} is an apocalyptic number.

It is an amenable number.

21616220411401 is a deficient number, since it is larger than the sum of its proper divisors (5574587515511).

21616220411401 is a wasteful number, since it uses less digits than its factorization.

21616220411401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34349253 (or 34349242 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 31.

The spelling of 21616220411401 in words is "twenty-one trillion, six hundred sixteen billion, two hundred twenty million, four hundred eleven thousand, four hundred one".