22322221 has 4 divisors (see below), whose sum is σ = 22393852. Its totient is φ = 22250592.

The previous prime is 22322197. The next prime is 22322231. The reversal of 22322221 is 12222322.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1946025 + 20376196 = 1395^2 + 4514^2 .

It is a cyclic number.

It is not a de Polignac number, because 22322221 - 2²¹ = 20225069 is a prime.

It is a super-3 number, since 3×22322221³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22322195 and 22322204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22322231) 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, 35346 + ... + 35971.

It is an arithmetic number, because the mean of its divisors is an integer number (5598463).

Almost surely, 2^22322221 is an apocalyptic number.

It is an amenable number.

22322221 is a deficient number, since it is larger than the sum of its proper divisors (71631).

22322221 is an equidigital number, since it uses as much as digits as its factorization.

22322221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71630.

The product of its digits is 192, while the sum is 16.

The square root of 22322221 is about 4724.6397746283. The cubic root of 22322221 is about 281.5653019632.

Adding to 22322221 its reverse (12222322), we get a palindrome (34544543).

The spelling of 22322221 in words is "twenty-two million, three hundred twenty-two thousand, two hundred twenty-one".