22221815 has 16 divisors (see below), whose sum is σ = 33246720. Its totient is φ = 13852320.

The previous prime is 22221799. The next prime is 22221817. The reversal of 22221815 is 51812222.

It is not a de Polignac number, because 22221815 - 2⁴ = 22221799 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22221817) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28475 + ... + 29244.

It is an arithmetic number, because the mean of its divisors is an integer number (2077920).

Almost surely, 2^22221815 is an apocalyptic number.

22221815 is a deficient number, since it is larger than the sum of its proper divisors (11024905).

22221815 is a wasteful number, since it uses less digits than its factorization.

22221815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57742.

The product of its digits is 640, while the sum is 23.

The square root of 22221815 is about 4714.0020152732. The cubic root of 22221815 is about 281.1425044341.

The spelling of 22221815 in words is "twenty-two million, two hundred twenty-one thousand, eight hundred fifteen".