21437136131 has 4 divisors (see below), whose sum is σ = 22369185552. Its totient is φ = 20505086712.

The previous prime is 21437136079. The next prime is 21437136157. The reversal of 21437136131 is 13163173412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21437136131 - 2⁶ = 21437136067 is a prime.

It is a super-2 number, since 2×21437136131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21437136181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 466024676 + ... + 466024721.

It is an arithmetic number, because the mean of its divisors is an integer number (5592296388).

Almost surely, 2^21437136131 is an apocalyptic number.

21437136131 is a deficient number, since it is larger than the sum of its proper divisors (932049421).

21437136131 is an equidigital number, since it uses as much as digits as its factorization.

21437136131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 932049420.

The product of its digits is 9072, while the sum is 32.

The spelling of 21437136131 in words is "twenty-one billion, four hundred thirty-seven million, one hundred thirty-six thousand, one hundred thirty-one".