22155871 has 4 divisors (see below), whose sum is σ = 22519144. Its totient is φ = 21792600.

The previous prime is 22155869. The next prime is 22155893. The reversal of 22155871 is 17855122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17855122 = 2 ⋅8927561.

It is a cyclic number.

It is not a de Polignac number, because 22155871 - 2¹ = 22155869 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 (22155841) 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, 181545 + ... + 181666.

It is an arithmetic number, because the mean of its divisors is an integer number (5629786).

Almost surely, 2^22155871 is an apocalyptic number.

22155871 is a deficient number, since it is larger than the sum of its proper divisors (363273).

22155871 is an equidigital number, since it uses as much as digits as its factorization.

22155871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363272.

The product of its digits is 5600, while the sum is 31.

The square root of 22155871 is about 4707.0023369444. The cubic root of 22155871 is about 280.8641288734.

The spelling of 22155871 in words is "twenty-two million, one hundred fifty-five thousand, eight hundred seventy-one".