22912281 has 16 divisors (see below), whose sum is σ = 38793600. Its totient is φ = 13092624.

The previous prime is 22912229. The next prime is 22912283. The reversal of 22912281 is 18221922.

It is not a de Polignac number, because 22912281 - 2⁶ = 22912217 is a prime.

It is a super-2 number, since 2×22912281² = 1049945241245922, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

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 (22912283) 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, 60426 + ... + 60803.

It is an arithmetic number, because the mean of its divisors is an integer number (2424600).

Almost surely, 2^22912281 is an apocalyptic number.

22912281 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

22912281 is a deficient number, since it is larger than the sum of its proper divisors (15881319).

22912281 is a wasteful number, since it uses less digits than its factorization.

22912281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121245 (or 121239 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 22912281 is about 4786.6774489201. The cubic root of 22912281 is about 284.0246994653.

The spelling of 22912281 in words is "twenty-two million, nine hundred twelve thousand, two hundred eighty-one".