21404100131 has 2 divisors, whose sum is σ = 21404100132. Its totient is φ = 21404100130.

The previous prime is 21404100101. The next prime is 21404100139. The reversal of 21404100131 is 13100140412.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21404100131 is a prime.

It is a super-2 number, since 2×21404100131² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21404100139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10702050065 + 10702050066.

It is an arithmetic number, because the mean of its divisors is an integer number (10702050066).

Almost surely, 2^21404100131 is an apocalyptic number.

21404100131 is a deficient number, since it is larger than the sum of its proper divisors (1).

21404100131 is an equidigital number, since it uses as much as digits as its factorization.

21404100131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21404100131 its reverse (13100140412), we get a palindrome (34504240543).

The spelling of 21404100131 in words is "twenty-one billion, four hundred four million, one hundred thousand, one hundred thirty-one".