21100400131 has 2 divisors, whose sum is σ = 21100400132. Its totient is φ = 21100400130.

The previous prime is 21100400093. The next prime is 21100400137. The reversal of 21100400131 is 13100400112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21100400131 - 2⁷ = 21100400003 is a prime.

It is a super-2 number, since 2×21100400131² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21100400137) 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, 10550200065 + 10550200066.

It is an arithmetic number, because the mean of its divisors is an integer number (10550200066).

Almost surely, 2^21100400131 is an apocalyptic number.

21100400131 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100400131 is an equidigital number, since it uses as much as digits as its factorization.

21100400131 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 21100400131 its reverse (13100400112), we get a palindrome (34200800243).

The spelling of 21100400131 in words is "twenty-one billion, one hundred million, four hundred thousand, one hundred thirty-one".