22531213 has 4 divisors (see below), whose sum is σ = 22638208. Its totient is φ = 22424220.

The previous prime is 22531193. The next prime is 22531217. The reversal of 22531213 is 31213522.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 22531213 - 2⁹ = 22530701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22531217) 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, 53181 + ... + 53602.

It is an arithmetic number, because the mean of its divisors is an integer number (5659552).

Almost surely, 2^22531213 is an apocalyptic number.

It is an amenable number.

22531213 is a deficient number, since it is larger than the sum of its proper divisors (106995).

22531213 is a wasteful number, since it uses less digits than its factorization.

22531213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106994.

The product of its digits is 360, while the sum is 19.

The square root of 22531213 is about 4746.7054890734. The cubic root of 22531213 is about 282.4412930453.

Adding to 22531213 its reverse (31213522), we get a palindrome (53744735).

The spelling of 22531213 in words is "twenty-two million, five hundred thirty-one thousand, two hundred thirteen".