22372281 has 14 divisors (see below), whose sum is σ = 33544170. Its totient is φ = 14914368.

The previous prime is 22372279. The next prime is 22372283. The reversal of 22372281 is 18227322.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (22372279) and next prime (22372283).

It can be written as a sum of positive squares in only one way, i.e., 22325625 + 46656 = 4725^2 + 216^2 .

It is not a de Polignac number, because 22372281 - 2¹ = 22372279 is a prime.

It is a super-2 number, since 2×22372281² = 1001037914285922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (22372283) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 14616 + ... + 16073.

Almost surely, 2^22372281 is an apocalyptic number.

It is an amenable number.

22372281 is a deficient number, since it is larger than the sum of its proper divisors (11171889).

22372281 is an frugal number, since it uses more digits than its factorization.

22372281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30707 (or 30692 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 22372281 is about 4729.9345661436. The cubic root of 22372281 is about 281.7756250531.

The spelling of 22372281 in words is "twenty-two million, three hundred seventy-two thousand, two hundred eighty-one".