21431430313 has 4 divisors (see below), whose sum is σ = 21887418240. Its totient is φ = 20975442388.

The previous prime is 21431430299. The next prime is 21431430329. The reversal of 21431430313 is 31303413412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21431430313 - 2⁵ = 21431430281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21431440313) 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, 227993893 + ... + 227993986.

It is an arithmetic number, because the mean of its divisors is an integer number (5471854560).

Almost surely, 2^21431430313 is an apocalyptic number.

It is an amenable number.

21431430313 is a deficient number, since it is larger than the sum of its proper divisors (455987927).

21431430313 is an equidigital number, since it uses as much as digits as its factorization.

21431430313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455987926.

The product of its (nonzero) digits is 2592, while the sum is 25.

Adding to 21431430313 its reverse (31303413412), we get a palindrome (52734843725).

The spelling of 21431430313 in words is "twenty-one billion, four hundred thirty-one million, four hundred thirty thousand, three hundred thirteen".