22157171 has 4 divisors (see below), whose sum is σ = 23460552. Its totient is φ = 20853792.

The previous prime is 22157167. The next prime is 22157207. The reversal of 22157171 is 17175122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17175122 = 2 ⋅8587561.

It is a cyclic number.

It is not a de Polignac number, because 22157171 - 2² = 22157167 is a prime.

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 22157171.

It is not an unprimeable number, because it can be changed into a prime (22117171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 651665 + ... + 651698.

It is an arithmetic number, because the mean of its divisors is an integer number (5865138).

Almost surely, 2^22157171 is an apocalyptic number.

22157171 is a deficient number, since it is larger than the sum of its proper divisors (1303381).

22157171 is a wasteful number, since it uses less digits than its factorization.

22157171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1303380.

The product of its digits is 980, while the sum is 26.

The square root of 22157171 is about 4707.1404270534. The cubic root of 22157171 is about 280.8696220183.

The spelling of 22157171 in words is "twenty-two million, one hundred fifty-seven thousand, one hundred seventy-one".