21234628644313 has 4 divisors (see below), whose sum is σ = 24268147022080. Its totient is φ = 18201110266548.

The previous prime is 21234628644287. The next prime is 21234628644377. The reversal of 21234628644313 is 31344682643212.

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 21234628644313 - 2²⁵ = 21234595089881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21234628644913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1516759188873 + ... + 1516759188886.

It is an arithmetic number, because the mean of its divisors is an integer number (6067036755520).

Almost surely, 2^{21234628644313} is an apocalyptic number.

It is an amenable number.

21234628644313 is a deficient number, since it is larger than the sum of its proper divisors (3033518377767).

21234628644313 is an equidigital number, since it uses as much as digits as its factorization.

21234628644313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3033518377766.

The product of its digits is 3981312, while the sum is 49.

The spelling of 21234628644313 in words is "twenty-one trillion, two hundred thirty-four billion, six hundred twenty-eight million, six hundred forty-four thousand, three hundred thirteen".