22029981 has 8 divisors (see below), whose sum is σ = 29998464. Its totient is φ = 14374080.

The previous prime is 22029979. The next prime is 22029983. The reversal of 22029981 is 18992022.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (22029979) and next prime (22029983).

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

It is not a de Polignac number, because 22029981 - 2¹ = 22029979 is a prime.

It is a super-2 number, since 2×22029981² = 970640125720722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22029983) 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 7 ways as a sum of consecutive naturals, for example, 77980 + ... + 78261.

It is an arithmetic number, because the mean of its divisors is an integer number (3749808).

Almost surely, 2^22029981 is an apocalyptic number.

22029981 is the 2969-th centered pentagonal number.

It is an amenable number.

22029981 is a deficient number, since it is larger than the sum of its proper divisors (7968483).

22029981 is a wasteful number, since it uses less digits than its factorization.

22029981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156291.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 22029981 is about 4693.6106570528. The cubic root of 22029981 is about 280.3311600486.

The spelling of 22029981 in words is "twenty-two million, twenty-nine thousand, nine hundred eighty-one".