21670641131 has 2 divisors, whose sum is σ = 21670641132. Its totient is φ = 21670641130.

The previous prime is 21670641073. The next prime is 21670641151. The reversal of 21670641131 is 13114607612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21670641131 - 2⁶ = 21670641067 is a prime.

It is a super-2 number, since 2×21670641131² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21670641151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10835320565 + 10835320566.

It is an arithmetic number, because the mean of its divisors is an integer number (10835320566).

Almost surely, 2^21670641131 is an apocalyptic number.

21670641131 is a deficient number, since it is larger than the sum of its proper divisors (1).

21670641131 is an equidigital number, since it uses as much as digits as its factorization.

21670641131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 32.

The spelling of 21670641131 in words is "twenty-one billion, six hundred seventy million, six hundred forty-one thousand, one hundred thirty-one".