22161456 has 60 divisors (see below), whose sum is σ = 62974392. Its totient is φ = 7273728.

The previous prime is 22161449. The next prime is 22161463. The reversal of 22161456 is 65416122.

It is an interprime number because it is at equal distance from previous prime (22161449) and next prime (22161463).

It is a super-2 number, since 2×22161456² = 982260264079872, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8500 + ... + 10796.

Almost surely, 2^22161456 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22161456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31487196).

22161456 is an abundant number, since it is smaller than the sum of its proper divisors (40812936).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22161456 is a wasteful number, since it uses less digits than its factorization.

22161456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2378 (or 2369 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 22161456 is about 4707.5955646168. The cubic root of 22161456 is about 280.8877267476.

Adding to 22161456 its reverse (65416122), we get a palindrome (87577578).

The spelling of 22161456 in words is "twenty-two million, one hundred sixty-one thousand, four hundred fifty-six".