21306055332066 has 16 divisors (see below), whose sum is σ = 43986694879488. Its totient is φ = 6872921074800.

The previous prime is 21306055332061. The next prime is 21306055332077. The reversal of 21306055332066 is 66023355060312.

It is not an unprimeable number, because it can be changed into a prime (21306055332061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57274342105 + ... + 57274342476.

It is an arithmetic number, because the mean of its divisors is an integer number (2749168429968).

Almost surely, 2^{21306055332066} is an apocalyptic number.

21306055332066 is an abundant number, since it is smaller than the sum of its proper divisors (22680639547422).

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

21306055332066 is a wasteful number, since it uses less digits than its factorization.

21306055332066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114548684617.

The product of its (nonzero) digits is 583200, while the sum is 42.

The spelling of 21306055332066 in words is "twenty-one trillion, three hundred six billion, fifty-five million, three hundred thirty-two thousand, sixty-six".