22402281 has 16 divisors (see below), whose sum is σ = 32981760. Its totient is φ = 13411920.

The previous prime is 22402271. The next prime is 22402283. The reversal of 22402281 is 18220422.

It is a happy number.

It is not a de Polignac number, because 22402281 - 2⁶ = 22402217 is a prime.

It is a super-2 number, since 2×22402281² = 1003724388005922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (22402283) 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, 1351 + ... + 6828.

It is an arithmetic number, because the mean of its divisors is an integer number (2061360).

Almost surely, 2^22402281 is an apocalyptic number.

It is an amenable number.

22402281 is a deficient number, since it is larger than the sum of its proper divisors (10579479).

22402281 is a wasteful number, since it uses less digits than its factorization.

22402281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8276.

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 22402281 is about 4733.1047949523. The cubic root of 22402281 is about 281.9015173438.

The spelling of 22402281 in words is "twenty-two million, four hundred two thousand, two hundred eighty-one".