21222944291 has 2 divisors, whose sum is σ = 21222944292. Its totient is φ = 21222944290.

The previous prime is 21222944287. The next prime is 21222944297. The reversal of 21222944291 is 19244922212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21222944291 - 2² = 21222944287 is a prime.

It is a super-4 number, since 4×21222944291⁴ (a number of 42 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (21222944297) 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, 10611472145 + 10611472146.

It is an arithmetic number, because the mean of its divisors is an integer number (10611472146).

Almost surely, 2^21222944291 is an apocalyptic number.

21222944291 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222944291 is an equidigital number, since it uses as much as digits as its factorization.

21222944291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 38.

The spelling of 21222944291 in words is "twenty-one billion, two hundred twenty-two million, nine hundred forty-four thousand, two hundred ninety-one".