21162025373 has 4 divisors (see below), whose sum is σ = 21612281280. Its totient is φ = 20711769468.

The previous prime is 21162025361. The next prime is 21162025397. The reversal of 21162025373 is 37352026112.

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 21162025373 - 2¹⁸ = 21161763229 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 (21162025343) 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, 225127883 + ... + 225127976.

It is an arithmetic number, because the mean of its divisors is an integer number (5403070320).

Almost surely, 2^21162025373 is an apocalyptic number.

It is an amenable number.

21162025373 is a deficient number, since it is larger than the sum of its proper divisors (450255907).

21162025373 is an equidigital number, since it uses as much as digits as its factorization.

21162025373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450255906.

The product of its (nonzero) digits is 15120, while the sum is 32.

The spelling of 21162025373 in words is "twenty-one billion, one hundred sixty-two million, twenty-five thousand, three hundred seventy-three".