21216043060555 has 32 divisors (see below), whose sum is σ = 29220274013184. Its totient is φ = 14486218782336.

The previous prime is 21216043060543. The next prime is 21216043060579. The reversal of 21216043060555 is 55506034061212.

It is not a de Polignac number, because 21216043060555 - 2²³ = 21216034671947 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14250264 + ... + 15668506.

It is an arithmetic number, because the mean of its divisors is an integer number (913133562912).

Almost surely, 2^{21216043060555} is an apocalyptic number.

21216043060555 is a deficient number, since it is larger than the sum of its proper divisors (8004230952629).

21216043060555 is a wasteful number, since it uses less digits than its factorization.

21216043060555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1420075.

The product of its (nonzero) digits is 216000, while the sum is 40.

The spelling of 21216043060555 in words is "twenty-one trillion, two hundred sixteen billion, forty-three million, sixty thousand, five hundred fifty-five".