22642 has 4 divisors (see below), whose sum is σ = 33966. Its totient is φ = 11320.

The previous prime is 22639. The next prime is 22643. The reversal of 22642 is 24622.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 22201 + 441 = 149^2 + 21^2 .

It is a plaindrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (22643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5659 + ... + 5662.

2²²⁶⁴² is an apocalyptic number.

22642 is a deficient number, since it is larger than the sum of its proper divisors (11324).

22642 is a wasteful number, since it uses less digits than its factorization.

22642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11323.

The product of its digits is 192, while the sum is 16.

The square root of 22642 is about 150.4725888659. The cubic root of 22642 is about 28.2903461934.

The spelling of 22642 in words is "twenty-two thousand, six hundred forty-two".