21621670131 has 16 divisors (see below), whose sum is σ = 29614464000. Its totient is φ = 14021830368.

The previous prime is 21621670111. The next prime is 21621670139. The reversal of 21621670131 is 13107612612.

It is not a de Polignac number, because 21621670131 - 2³⁴ = 4441800947 is a prime.

It is a super-2 number, since 2×21621670131² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21621670139) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 567520 + ... + 604418.

It is an arithmetic number, because the mean of its divisors is an integer number (1850904000).

Almost surely, 2^21621670131 is an apocalyptic number.

21621670131 is a deficient number, since it is larger than the sum of its proper divisors (7992793869).

21621670131 is a wasteful number, since it uses less digits than its factorization.

21621670131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42218.

The product of its (nonzero) digits is 3024, while the sum is 30.

The spelling of 21621670131 in words is "twenty-one billion, six hundred twenty-one million, six hundred seventy thousand, one hundred thirty-one".