22213121 has 6 divisors (see below), whose sum is σ = 25839810. Its totient is φ = 19039776.

The previous prime is 22213117. The next prime is 22213127. The reversal of 22213121 is 12131222.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 22193521 + 19600 = 4711^2 + 140^2 .

It is not a de Polignac number, because 22213121 - 2² = 22213117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22213096 and 22213105.

It is not an unprimeable number, because it can be changed into a prime (22213127) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 226616 + ... + 226713.

It is an arithmetic number, because the mean of its divisors is an integer number (4306635).

Almost surely, 2^22213121 is an apocalyptic number.

It is an amenable number.

22213121 is a deficient number, since it is larger than the sum of its proper divisors (3626689).

22213121 is an equidigital number, since it uses as much as digits as its factorization.

22213121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453343 (or 453336 counting only the distinct ones).

The product of its digits is 48, while the sum is 14.

The square root of 22213121 is about 4713.0797786585. The cubic root of 22213121 is about 281.1058351857.

Adding to 22213121 its reverse (12131222), we get a palindrome (34344343).

The spelling of 22213121 in words is "twenty-two million, two hundred thirteen thousand, one hundred twenty-one".