22642231 has 4 divisors (see below), whose sum is σ = 22660912. Its totient is φ = 22623552.

The previous prime is 22642229. The next prime is 22642259. The reversal of 22642231 is 13224622.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13224622 = 2 ⋅6612311.

It is a cyclic number.

It is not a de Polignac number, because 22642231 - 2¹ = 22642229 is a prime.

It is a super-2 number, since 2×22642231² = 1025341249314722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22642201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7386 + ... + 9991.

It is an arithmetic number, because the mean of its divisors is an integer number (5665228).

Almost surely, 2^22642231 is an apocalyptic number.

22642231 is a deficient number, since it is larger than the sum of its proper divisors (18681).

22642231 is a wasteful number, since it uses less digits than its factorization.

22642231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18680.

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

The square root of 22642231 is about 4758.3853353843. The cubic root of 22642231 is about 282.9044240177.

Adding to 22642231 its reverse (13224622), we get a palindrome (35866853).

The spelling of 22642231 in words is "twenty-two million, six hundred forty-two thousand, two hundred thirty-one".