22612221 has 6 divisors (see below), whose sum is σ = 32662110. Its totient is φ = 15074808.

The previous prime is 22612211. The next prime is 22612229. The reversal of 22612221 is 12221622.

It can be written as a sum of positive squares in only one way, i.e., 19263321 + 3348900 = 4389^2 + 1830^2 .

It is not a de Polignac number, because 22612221 - 2⁵ = 22612189 is a prime.

It is a super-2 number, since 2×22612221² = 1022625077105682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 22612194 and 22612203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22612229) by changing a digit.

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 in 5 ways as a sum of consecutive naturals, for example, 1256226 + ... + 1256243.

It is an arithmetic number, because the mean of its divisors is an integer number (5443685).

Almost surely, 2^22612221 is an apocalyptic number.

It is an amenable number.

22612221 is a deficient number, since it is larger than the sum of its proper divisors (10049889).

22612221 is a wasteful number, since it uses less digits than its factorization.

22612221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2512475 (or 2512472 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 22612221 is about 4755.2309092199. The cubic root of 22612221 is about 282.7793816372.

Adding to 22612221 its reverse (12221622), we get a palindrome (34833843).

The spelling of 22612221 in words is "twenty-two million, six hundred twelve thousand, two hundred twenty-one".