21616220443155 has 16 divisors (see below), whose sum is σ = 37246410610080. Its totient is φ = 10641831602688.

The previous prime is 21616220443117. The next prime is 21616220443183. The reversal of 21616220443155 is 55134402261612.

It is not a de Polignac number, because 21616220443155 - 2⁶ = 21616220443091 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55426206070 + ... + 55426206459.

It is an arithmetic number, because the mean of its divisors is an integer number (2327900663130).

Almost surely, 2^{21616220443155} is an apocalyptic number.

21616220443155 is a deficient number, since it is larger than the sum of its proper divisors (15630190166925).

21616220443155 is a wasteful number, since it uses less digits than its factorization.

21616220443155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110852412550.

The product of its (nonzero) digits is 345600, while the sum is 42.

The spelling of 21616220443155 in words is "twenty-one trillion, six hundred sixteen billion, two hundred twenty million, four hundred forty-three thousand, one hundred fifty-five".