22165510021 has 4 divisors (see below), whose sum is σ = 23129227872. Its totient is φ = 21201792172.

The previous prime is 22165510019. The next prime is 22165510069. The reversal of 22165510021 is 12001556122.

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 22165510021 - 2¹ = 22165510019 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 (22165510001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 481858891 + ... + 481858936.

It is an arithmetic number, because the mean of its divisors is an integer number (5782306968).

Almost surely, 2^22165510021 is an apocalyptic number.

It is an amenable number.

22165510021 is a deficient number, since it is larger than the sum of its proper divisors (963717851).

22165510021 is an equidigital number, since it uses as much as digits as its factorization.

22165510021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 963717850.

The product of its (nonzero) digits is 1200, while the sum is 25.

The spelling of 22165510021 in words is "twenty-two billion, one hundred sixty-five million, five hundred ten thousand, twenty-one".