22513212 has 18 divisors (see below), whose sum is σ = 56908488. Its totient is φ = 7504392.

The previous prime is 22513207. The next prime is 22513213. The reversal of 22513212 is 21231522.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22513213) 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, 312648 + ... + 312719.

Almost surely, 2^22513212 is an apocalyptic number.

It is an amenable number.

22513212 is an abundant number, since it is smaller than the sum of its proper divisors (34395276).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22513212 is a wasteful number, since it uses less digits than its factorization.

22513212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625377 (or 625372 counting only the distinct ones).

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

The square root of 22513212 is about 4744.8089529506. The cubic root of 22513212 is about 282.3660554877.

Adding to 22513212 its reverse (21231522), we get a palindrome (43744734).

The spelling of 22513212 in words is "twenty-two million, five hundred thirteen thousand, two hundred twelve".