21430468931 has 4 divisors (see below), whose sum is σ = 22009670832. Its totient is φ = 20851267032.

The previous prime is 21430468921. The next prime is 21430468949. The reversal of 21430468931 is 13986403412.

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 21430468931 - 2⁶ = 21430468867 is a prime.

It is a super-2 number, since 2×21430468931² (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 (21430468921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 289600895 + ... + 289600968.

It is an arithmetic number, because the mean of its divisors is an integer number (5502417708).

Almost surely, 2^21430468931 is an apocalyptic number.

21430468931 is a deficient number, since it is larger than the sum of its proper divisors (579201901).

21430468931 is an equidigital number, since it uses as much as digits as its factorization.

21430468931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 579201900.

The product of its (nonzero) digits is 124416, while the sum is 41.

The spelling of 21430468931 in words is "twenty-one billion, four hundred thirty million, four hundred sixty-eight thousand, nine hundred thirty-one".