21234430313 has 4 divisors (see below), whose sum is σ = 21919411968. Its totient is φ = 20549448660.

The previous prime is 21234430307. The next prime is 21234430319. The reversal of 21234430313 is 31303443212.

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 an interprime number because it is at equal distance from previous prime (21234430307) and next prime (21234430319).

It is a cyclic number.

It is not a de Polignac number, because 21234430313 - 2⁴ = 21234430297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21234430319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 342490781 + ... + 342490842.

It is an arithmetic number, because the mean of its divisors is an integer number (5479852992).

Almost surely, 2^21234430313 is an apocalyptic number.

It is an amenable number.

21234430313 is a deficient number, since it is larger than the sum of its proper divisors (684981655).

21234430313 is an equidigital number, since it uses as much as digits as its factorization.

21234430313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 684981654.

The product of its (nonzero) digits is 5184, while the sum is 26.

Adding to 21234430313 its reverse (31303443212), we get a palindrome (52537873525).

The spelling of 21234430313 in words is "twenty-one billion, two hundred thirty-four million, four hundred thirty thousand, three hundred thirteen".