22013231 has 4 divisors (see below), whose sum is σ = 22970352. Its totient is φ = 21056112.

The previous prime is 22013227. The next prime is 22013239. The reversal of 22013231 is 13231022.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 22013231 - 2² = 22013227 is a prime.

It is a super-2 number, since 2×22013231² = 969164678118722, 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 (22013239) 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, 478526 + ... + 478571.

It is an arithmetic number, because the mean of its divisors is an integer number (5742588).

Almost surely, 2^22013231 is an apocalyptic number.

22013231 is a deficient number, since it is larger than the sum of its proper divisors (957121).

22013231 is an equidigital number, since it uses as much as digits as its factorization.

22013231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 957120.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 22013231 is about 4691.8259771650. The cubic root of 22013231 is about 280.2600942060.

Adding to 22013231 its reverse (13231022), we get a palindrome (35244253).

The spelling of 22013231 in words is "twenty-two million, thirteen thousand, two hundred thirty-one".