21100403131 has 2 divisors, whose sum is σ = 21100403132. Its totient is φ = 21100403130.

The previous prime is 21100403083. The next prime is 21100403143. The reversal of 21100403131 is 13130400112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21100403131 - 2⁷ = 21100403003 is a prime.

It is a super-2 number, since 2×21100403131² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21100400131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550201565 + 10550201566.

It is an arithmetic number, because the mean of its divisors is an integer number (10550201566).

Almost surely, 2^21100403131 is an apocalyptic number.

21100403131 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100403131 is an equidigital number, since it uses as much as digits as its factorization.

21100403131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21100403131 its reverse (13130400112), we get a palindrome (34230803243).

The spelling of 21100403131 in words is "twenty-one billion, one hundred million, four hundred three thousand, one hundred thirty-one".