22616221 has 4 divisors (see below), whose sum is σ = 22651200. Its totient is φ = 22581244.

The previous prime is 22616207. The next prime is 22616227. The reversal of 22616221 is 12261622.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 22616221 - 2⁷ = 22616093 is a prime.

It is a super-2 number, since 2×22616221² = 1022986904641682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22616192 and 22616201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22616227) 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, 16501 + ... + 17818.

It is an arithmetic number, because the mean of its divisors is an integer number (5662800).

Almost surely, 2^22616221 is an apocalyptic number.

It is an amenable number.

22616221 is a deficient number, since it is larger than the sum of its proper divisors (34979).

22616221 is an equidigital number, since it uses as much as digits as its factorization.

22616221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34978.

The product of its digits is 576, while the sum is 22.

The square root of 22616221 is about 4755.6514800814. The cubic root of 22616221 is about 282.7960547869.

Adding to 22616221 its reverse (12261622), we get a palindrome (34877843).

The spelling of 22616221 in words is "twenty-two million, six hundred sixteen thousand, two hundred twenty-one".