22171087 has 4 divisors (see below), whose sum is σ = 22304016. Its totient is φ = 22038160.

The previous prime is 22171063. The next prime is 22171091. The reversal of 22171087 is 78017122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 22171087 - 2⁷ = 22170959 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 (22171027) 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, 66214 + ... + 66547.

It is an arithmetic number, because the mean of its divisors is an integer number (5576004).

Almost surely, 2^22171087 is an apocalyptic number.

22171087 is a deficient number, since it is larger than the sum of its proper divisors (132929).

22171087 is a wasteful number, since it uses less digits than its factorization.

22171087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132928.

The product of its (nonzero) digits is 1568, while the sum is 28.

The square root of 22171087 is about 4708.6183748526. The cubic root of 22171087 is about 280.9284105654.

The spelling of 22171087 in words is "twenty-two million, one hundred seventy-one thousand, eighty-seven".