21364764004013 has 4 divisors (see below), whose sum is σ = 21364786533468. Its totient is φ = 21364741474560.

The previous prime is 21364764003931. The next prime is 21364764004021. The reversal of 21364764004013 is 31040046746312.

It is a happy number.

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 12931884864649 + 8432879139364 = 3596093^2 + 2903942^2 .

It is a cyclic number.

It is not a de Polignac number, because 21364764004013 - 2³⁸ = 21089886097069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21364764004043) 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, 9776756 + ... + 11760717.

It is an arithmetic number, because the mean of its divisors is an integer number (5341196633367).

Almost surely, 2^{21364764004013} is an apocalyptic number.

It is an amenable number.

21364764004013 is a deficient number, since it is larger than the sum of its proper divisors (22529455).

21364764004013 is an equidigital number, since it uses as much as digits as its factorization.

21364764004013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22529454.

The product of its (nonzero) digits is 290304, while the sum is 41.

The spelling of 21364764004013 in words is "twenty-one trillion, three hundred sixty-four billion, seven hundred sixty-four million, four thousand, thirteen".