22165021 has 4 divisors (see below), whose sum is σ = 22528444. Its totient is φ = 21801600.

The previous prime is 22165009. The next prime is 22165027. The reversal of 22165021 is 12056122.

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 1562500 + 20602521 = 1250^2 + 4539^2 .

It is a cyclic number.

It is not a de Polignac number, because 22165021 - 2⁹ = 22164509 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 22165021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22165027) 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, 181620 + ... + 181741.

It is an arithmetic number, because the mean of its divisors is an integer number (5632111).

Almost surely, 2^22165021 is an apocalyptic number.

It is an amenable number.

22165021 is a deficient number, since it is larger than the sum of its proper divisors (363423).

22165021 is an equidigital number, since it uses as much as digits as its factorization.

22165021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363422.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 22165021 is about 4707.9741927925. The cubic root of 22165021 is about 280.9027875971.

The spelling of 22165021 in words is "twenty-two million, one hundred sixty-five thousand, twenty-one".