21120122131 has 2 divisors, whose sum is σ = 21120122132. Its totient is φ = 21120122130.

The previous prime is 21120122129. The next prime is 21120122143. The reversal of 21120122131 is 13122102112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21120122131 - 2¹ = 21120122129 is a prime.

It is a super-2 number, since 2×21120122131² (a number of 21 digits) contains 22 as substring.

Together with 21120122129, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21120722131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560061065 + 10560061066.

It is an arithmetic number, because the mean of its divisors is an integer number (10560061066).

Almost surely, 2^21120122131 is an apocalyptic number.

21120122131 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120122131 is an equidigital number, since it uses as much as digits as its factorization.

21120122131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21120122131 its reverse (13122102112), we get a palindrome (34242224243).

It can be divided in two parts, 211201 and 22131, that added together give a palindrome (233332).

The spelling of 21120122131 in words is "twenty-one billion, one hundred twenty million, one hundred twenty-two thousand, one hundred thirty-one".