22215213 has 6 divisors (see below), whose sum is σ = 32088654. Its totient is φ = 14810136.

The previous prime is 22215197. The next prime is 22215223. The reversal of 22215213 is 31251222.

It can be written as a sum of positive squares in only one way, i.e., 18688329 + 3526884 = 4323^2 + 1878^2 .

It is not a de Polignac number, because 22215213 - 2⁴ = 22215197 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22215223) 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, 1234170 + ... + 1234187.

It is an arithmetic number, because the mean of its divisors is an integer number (5348109).

Almost surely, 2^22215213 is an apocalyptic number.

It is an amenable number.

22215213 is a deficient number, since it is larger than the sum of its proper divisors (9873441).

22215213 is a wasteful number, since it uses less digits than its factorization.

22215213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2468363 (or 2468360 counting only the distinct ones).

The product of its digits is 240, while the sum is 18.

The square root of 22215213 is about 4713.3017089934. The cubic root of 22215213 is about 281.1146596240.

Adding to 22215213 its reverse (31251222), we get a palindrome (53466435).

The spelling of 22215213 in words is "twenty-two million, two hundred fifteen thousand, two hundred thirteen".