21424804608313 has 4 divisors (see below), whose sum is σ = 21425079190900. Its totient is φ = 21424530025728.

The previous prime is 21424804608281. The next prime is 21424804608373. The reversal of 21424804608313 is 31380640842412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13176007035129 + 8248797573184 = 3629877^2 + 2872072^2 .

It is a cyclic number.

It is not a de Polignac number, because 21424804608313 - 2⁵ = 21424804608281 is a prime.

It is a super-2 number, since 2×21424804608313² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21424804608373) 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, 137174220 + ... + 137330317.

It is an arithmetic number, because the mean of its divisors is an integer number (5356269797725).

Almost surely, 2^{21424804608313} is an apocalyptic number.

It is an amenable number.

21424804608313 is a deficient number, since it is larger than the sum of its proper divisors (274582587).

21424804608313 is an equidigital number, since it uses as much as digits as its factorization.

21424804608313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274582586.

The product of its (nonzero) digits is 884736, while the sum is 46.

The spelling of 21424804608313 in words is "twenty-one trillion, four hundred twenty-four billion, eight hundred four million, six hundred eight thousand, three hundred thirteen".