22199981 has 8 divisors (see below), whose sum is σ = 22717440. Its totient is φ = 21688128.

The previous prime is 22199971. The next prime is 22200001. The reversal of 22199981 is 18999122.

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

It is a cyclic number.

It is not a de Polignac number, because 22199981 - 2¹⁴ = 22183597 is a prime.

It is a super-2 number, since 2×22199981² = 985678312800722, 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 (22199971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7205 + ... + 9813.

It is an arithmetic number, because the mean of its divisors is an integer number (2839680).

Almost surely, 2^22199981 is an apocalyptic number.

It is an amenable number.

22199981 is a deficient number, since it is larger than the sum of its proper divisors (517459).

22199981 is a wasteful number, since it uses less digits than its factorization.

22199981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2803.

The product of its digits is 23328, while the sum is 41.

The square root of 22199981 is about 4711.6855794928. The cubic root of 22199981 is about 281.0503955915.

The spelling of 22199981 in words is "twenty-two million, one hundred ninety-nine thousand, nine hundred eighty-one".