21222052413997 has 2 divisors, whose sum is σ = 21222052413998. Its totient is φ = 21222052413996.

The previous prime is 21222052413971. The next prime is 21222052414027. The reversal of 21222052413997 is 79931425022212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20968513981321 + 253538432676 = 4579139^2 + 503526^2 .

It is a cyclic number.

It is not a de Polignac number, because 21222052413997 - 2¹¹ = 21222052411949 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21222052413997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21222052413917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611026206998 + 10611026206999.

It is an arithmetic number, because the mean of its divisors is an integer number (10611026206999).

Almost surely, 2^{21222052413997} is an apocalyptic number.

It is an amenable number.

21222052413997 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222052413997 is an equidigital number, since it uses as much as digits as its factorization.

21222052413997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1088640, while the sum is 49.

The spelling of 21222052413997 in words is "twenty-one trillion, two hundred twenty-two billion, fifty-two million, four hundred thirteen thousand, nine hundred ninety-seven".