22115871 has 6 divisors (see below), whose sum is σ = 31945160. Its totient is φ = 14743908.

The previous prime is 22115839. The next prime is 22115887. The reversal of 22115871 is 17851122.

It is not a de Polignac number, because 22115871 - 2⁵ = 22115839 is a prime.

It is a super-2 number, since 2×22115871² = 978223500177282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22115831) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1228651 + ... + 1228668.

Almost surely, 2^22115871 is an apocalyptic number.

22115871 is a deficient number, since it is larger than the sum of its proper divisors (9829289).

22115871 is a wasteful number, since it uses less digits than its factorization.

22115871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2457325 (or 2457322 counting only the distinct ones).

The product of its digits is 1120, while the sum is 27.

The square root of 22115871 is about 4702.7514286851. The cubic root of 22115871 is about 280.6950039062.

Adding to 22115871 its reverse (17851122), we get a palindrome (39966993).

The spelling of 22115871 in words is "twenty-two million, one hundred fifteen thousand, eight hundred seventy-one".