22072281 has 64 divisors (see below), whose sum is σ = 39813120. Its totient is φ = 10532160.

The previous prime is 22072247. The next prime is 22072283. The reversal of 22072281 is 18227022.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-22072281 is a prime.

It is a super-2 number, since 2×22072281² = 974371177085922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (22072283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 206230 + ... + 206336.

It is an arithmetic number, because the mean of its divisors is an integer number (622080).

Almost surely, 2^22072281 is an apocalyptic number.

22072281 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

22072281 is a deficient number, since it is larger than the sum of its proper divisors (17740839).

22072281 is a wasteful number, since it uses less digits than its factorization.

22072281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194.

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 22072281 is about 4698.1146218457. The cubic root of 22072281 is about 280.5104676112.

The spelling of 22072281 in words is "twenty-two million, seventy-two thousand, two hundred eighty-one".