21674435131 has 4 divisors (see below), whose sum is σ = 21917968200. Its totient is φ = 21430902064.

The previous prime is 21674435053. The next prime is 21674435147. The reversal of 21674435131 is 13153447612.

It is a happy number.

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 21674435131 - 2⁹ = 21674434619 is a prime.

It is a super-2 number, since 2×21674435131² (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 (21674415131) 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, 121766401 + ... + 121766578.

It is an arithmetic number, because the mean of its divisors is an integer number (5479492050).

Almost surely, 2^21674435131 is an apocalyptic number.

21674435131 is a deficient number, since it is larger than the sum of its proper divisors (243533069).

21674435131 is an equidigital number, since it uses as much as digits as its factorization.

21674435131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243533068.

The product of its digits is 60480, while the sum is 37.

The spelling of 21674435131 in words is "twenty-one billion, six hundred seventy-four million, four hundred thirty-five thousand, one hundred thirty-one".