22231642 has 4 divisors (see below), whose sum is σ = 33347466. Its totient is φ = 11115820.

The previous prime is 22231637. The next prime is 22231667. The reversal of 22231642 is 24613222.

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., 13535041 + 8696601 = 3679^2 + 2949^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5557909 + ... + 5557912.

Almost surely, 2^22231642 is an apocalyptic number.

22231642 is a deficient number, since it is larger than the sum of its proper divisors (11115824).

22231642 is a wasteful number, since it uses less digits than its factorization.

22231642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11115823.

The product of its digits is 1152, while the sum is 22.

The square root of 22231642 is about 4715.0442203653. The cubic root of 22231642 is about 281.1839408970.

Adding to 22231642 its reverse (24613222), we get a palindrome (46844864).

The spelling of 22231642 in words is "twenty-two million, two hundred thirty-one thousand, six hundred forty-two".