22432221 has 20 divisors (see below), whose sum is σ = 38297952. Its totient is φ = 12818088.

The previous prime is 22432219. The next prime is 22432247. The reversal of 22432221 is 12223422.

It is not a de Polignac number, because 22432221 - 2¹ = 22432219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22432194 and 22432203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22432261) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 19215 + ... + 20348.

Almost surely, 2^22432221 is an apocalyptic number.

22432221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

22432221 is a deficient number, since it is larger than the sum of its proper divisors (15865731).

22432221 is an equidigital number, since it uses as much as digits as its factorization.

22432221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39582 (or 39573 counting only the distinct ones).

The product of its digits is 384, while the sum is 18.

The square root of 22432221 is about 4736.2665676670. The cubic root of 22432221 is about 282.0270458442.

Adding to 22432221 its reverse (12223422), we get a palindrome (34655643).

The spelling of 22432221 in words is "twenty-two million, four hundred thirty-two thousand, two hundred twenty-one".