21222944297 has 2 divisors, whose sum is σ = 21222944298. Its totient is φ = 21222944296.

The previous prime is 21222944291. The next prime is 21222944357. The reversal of 21222944297 is 79244922212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20571878041 + 651066256 = 143429^2 + 25516^2 .

It is a cyclic number.

It is not a de Polignac number, because 21222944297 - 2²⁶ = 21155835433 is a prime.

It is not a weakly prime, because it can be changed into another prime (21222944291) by changing a digit.

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 as a sum of consecutive naturals, namely, 10611472148 + 10611472149.

It is an arithmetic number, because the mean of its divisors is an integer number (10611472149).

Almost surely, 2^21222944297 is an apocalyptic number.

It is an amenable number.

21222944297 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222944297 is an equidigital number, since it uses as much as digits as its factorization.

21222944297 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290304, while the sum is 44.

The spelling of 21222944297 in words is "twenty-one billion, two hundred twenty-two million, nine hundred forty-four thousand, two hundred ninety-seven".