21432212313 has 4 divisors (see below), whose sum is σ = 28576283088. Its totient is φ = 14288141540.

The previous prime is 21432212303. The next prime is 21432212327. The reversal of 21432212313 is 31321223412.

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 21432212313 - 2⁵ = 21432212281 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21432212303) 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, 3572035383 + ... + 3572035388.

It is an arithmetic number, because the mean of its divisors is an integer number (7144070772).

Almost surely, 2^21432212313 is an apocalyptic number.

It is an amenable number.

21432212313 is a deficient number, since it is larger than the sum of its proper divisors (7144070775).

21432212313 is an equidigital number, since it uses as much as digits as its factorization.

21432212313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7144070774.

The product of its digits is 1728, while the sum is 24.

Adding to 21432212313 its reverse (31321223412), we get a palindrome (52753435725).

The spelling of 21432212313 in words is "twenty-one billion, four hundred thirty-two million, two hundred twelve thousand, three hundred thirteen".