21216362722063 has 2 divisors, whose sum is σ = 21216362722064. Its totient is φ = 21216362722062.

The previous prime is 21216362722057. The next prime is 21216362722067. The reversal of 21216362722063 is 36022726361212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21216362722063 - 2³³ = 21207772787471 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21216362722067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10608181361031 + 10608181361032.

It is an arithmetic number, because the mean of its divisors is an integer number (10608181361032).

Almost surely, 2^{21216362722063} is an apocalyptic number.

21216362722063 is a deficient number, since it is larger than the sum of its proper divisors (1).

21216362722063 is an equidigital number, since it uses as much as digits as its factorization.

21216362722063 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 435456, while the sum is 43.

The spelling of 21216362722063 in words is "twenty-one trillion, two hundred sixteen billion, three hundred sixty-two million, seven hundred twenty-two thousand, sixty-three".