22190861 has 16 divisors (see below), whose sum is σ = 28417920. Its totient is φ = 16822080.

The previous prime is 22190821. The next prime is 22190893. The reversal of 22190861 is 16809122.

22190861 = 154² + 155² + ... + 412².

It is not a de Polignac number, because 22190861 - 2¹⁰ = 22189837 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 (22190801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1046 + ... + 6743.

It is an arithmetic number, because the mean of its divisors is an integer number (1776120).

Almost surely, 2^22190861 is an apocalyptic number.

It is an amenable number.

22190861 is a deficient number, since it is larger than the sum of its proper divisors (6227059).

22190861 is a wasteful number, since it uses less digits than its factorization.

22190861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7844.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 22190861 is about 4710.7176735610. The cubic root of 22190861 is about 281.0119041068.

Adding to 22190861 its reverse (16809122), we get a palindrome (38999983).

The spelling of 22190861 in words is "twenty-two million, one hundred ninety thousand, eight hundred sixty-one".