22121690 has 8 divisors (see below), whose sum is σ = 39819060. Its totient is φ = 8848672.

The previous prime is 22121689. The next prime is 22121713. The reversal of 22121690 is 9612122.

It can be written as a sum of positive squares in 2 ways, for example, as 22118209 + 3481 = 4703^2 + 59^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×22121690² = 978738336912200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1106075 + ... + 1106094.

Almost surely, 2^22121690 is an apocalyptic number.

22121690 is a deficient number, since it is larger than the sum of its proper divisors (17697370).

22121690 is a wasteful number, since it uses less digits than its factorization.

22121690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2212176.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 22121690 is about 4703.3700683659. The cubic root of 22121690 is about 280.7196200291.

Adding to 22121690 its product of nonzero digits (432), we get a palindrome (22122122).

The spelling of 22121690 in words is "twenty-two million, one hundred twenty-one thousand, six hundred ninety".