21325216260353 has 4 divisors (see below), whose sum is σ = 21536357015508. Its totient is φ = 21114075505200.

The previous prime is 21325216260349. The next prime is 21325216260377. The reversal of 21325216260353 is 35306261252312.

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 20521561385329 + 803654875024 = 4530073^2 + 896468^2 .

It is a cyclic number.

It is not a de Polignac number, because 21325216260353 - 2² = 21325216260349 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21325216260353.

It is not an unprimeable number, because it can be changed into a prime (21325216260253) 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, 105570377426 + ... + 105570377627.

It is an arithmetic number, because the mean of its divisors is an integer number (5384089253877).

Almost surely, 2^{21325216260353} is an apocalyptic number.

It is an amenable number.

21325216260353 is a deficient number, since it is larger than the sum of its proper divisors (211140755155).

21325216260353 is a wasteful number, since it uses less digits than its factorization.

21325216260353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211140755154.

The product of its (nonzero) digits is 388800, while the sum is 41.

The spelling of 21325216260353 in words is "twenty-one trillion, three hundred twenty-five billion, two hundred sixteen million, two hundred sixty thousand, three hundred fifty-three".