21137679131 has 2 divisors, whose sum is σ = 21137679132. Its totient is φ = 21137679130.

The previous prime is 21137679089. The next prime is 21137679179. The reversal of 21137679131 is 13197673112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21137679131 - 2⁶ = 21137679067 is a prime.

It is a super-3 number, since 3×21137679131³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21137679331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10568839565 + 10568839566.

It is an arithmetic number, because the mean of its divisors is an integer number (10568839566).

Almost surely, 2^21137679131 is an apocalyptic number.

21137679131 is a deficient number, since it is larger than the sum of its proper divisors (1).

21137679131 is an equidigital number, since it uses as much as digits as its factorization.

21137679131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47628, while the sum is 41.

The spelling of 21137679131 in words is "twenty-one billion, one hundred thirty-seven million, six hundred seventy-nine thousand, one hundred thirty-one".