22215087 has 8 divisors (see below), whose sum is σ = 32911280. Its totient is φ = 14810040.

The previous prime is 22215049. The next prime is 22215091. The reversal of 22215087 is 78051222.

It is not a de Polignac number, because 22215087 - 2²⁰ = 21166511 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 822781 = 22215087 / (2 + 2 + 2 + 1 + 5 + 0 + 8 + 7).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22215087.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22215187) 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, 411364 + ... + 411417.

It is an arithmetic number, because the mean of its divisors is an integer number (4113910).

Almost surely, 2^22215087 is an apocalyptic number.

22215087 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

22215087 is a deficient number, since it is larger than the sum of its proper divisors (10696193).

22215087 is an equidigital number, since it uses as much as digits as its factorization.

22215087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 822790 (or 822784 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 22215087 is about 4713.2883425481. The cubic root of 22215087 is about 281.1141281487.

The spelling of 22215087 in words is "twenty-two million, two hundred fifteen thousand, eighty-seven".