22165522021 has 8 divisors (see below), whose sum is σ = 22483911744. Its totient is φ = 21847304640.

The previous prime is 22165522003. The next prime is 22165522039. The reversal of 22165522021 is 12022556122.

It is an interprime number because it is at equal distance from previous prime (22165522003) and next prime (22165522039).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22165522021 - 2¹⁹ = 22164997733 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 (22165522061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 228150 + ... + 310456.

It is an arithmetic number, because the mean of its divisors is an integer number (2810488968).

Almost surely, 2^22165522021 is an apocalyptic number.

It is an amenable number.

22165522021 is a deficient number, since it is larger than the sum of its proper divisors (318389723).

22165522021 is an equidigital number, since it uses as much as digits as its factorization.

22165522021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86171.

The product of its (nonzero) digits is 4800, while the sum is 28.

The spelling of 22165522021 in words is "twenty-two billion, one hundred sixty-five million, five hundred twenty-two thousand, twenty-one".