21222311959 has 2 divisors, whose sum is σ = 21222311960. Its totient is φ = 21222311958.

The previous prime is 21222311941. The next prime is 21222312011. The reversal of 21222311959 is 95911322212.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21222311959 is a prime.

It is a super-2 number, since 2×21222311959² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21222311059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611155979 + 10611155980.

It is an arithmetic number, because the mean of its divisors is an integer number (10611155980).

Almost surely, 2^21222311959 is an apocalyptic number.

21222311959 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222311959 is an equidigital number, since it uses as much as digits as its factorization.

21222311959 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 37.

The spelling of 21222311959 in words is "twenty-one billion, two hundred twenty-two million, three hundred eleven thousand, nine hundred fifty-nine".