22190881 has 12 divisors (see below), whose sum is σ = 23350096. Its totient is φ = 21077280.

The previous prime is 22190821. The next prime is 22190893. The reversal of 22190881 is 18809122.

It is a happy number.

It is not a de Polignac number, because 22190881 - 2⁹ = 22190369 is a prime.

It is a super-2 number, since 2×22190881² = 984870399112322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22190801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72130 + ... + 72436.

Almost surely, 2^22190881 is an apocalyptic number.

It is an amenable number.

22190881 is a deficient number, since it is larger than the sum of its proper divisors (1159215).

22190881 is an equidigital number, since it uses as much as digits as its factorization.

22190881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432 (or 391 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 22190881 is about 4710.7197963793. The cubic root of 22190881 is about 281.0119885295.

The spelling of 22190881 in words is "twenty-two million, one hundred ninety thousand, eight hundred eighty-one".