21221000131 has 2 divisors, whose sum is σ = 21221000132. Its totient is φ = 21221000130.

The previous prime is 21221000083. The next prime is 21221000149. The reversal of 21221000131 is 13100012212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21221000131 - 2²⁷ = 21086782403 is a prime.

It is a super-2 number, since 2×21221000131² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21221000191) 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, 10610500065 + 10610500066.

It is an arithmetic number, because the mean of its divisors is an integer number (10610500066).

Almost surely, 2^21221000131 is an apocalyptic number.

21221000131 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221000131 is an equidigital number, since it uses as much as digits as its factorization.

21221000131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21221000131 its reverse (13100012212), we get a palindrome (34321012343).

The spelling of 21221000131 in words is "twenty-one billion, two hundred twenty-one million, one hundred thirty-one", and thus it is an aban number.