22133213521 has 4 divisors (see below), whose sum is σ = 22136181172. Its totient is φ = 22130245872.

The previous prime is 22133213503. The next prime is 22133213533. The reversal of 22133213521 is 12531233122.

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 21582841921 + 550371600 = 146911^2 + 23460^2 .

It is a cyclic number.

It is not a de Polignac number, because 22133213521 - 2⁵ = 22133213489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22133213581) 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, 1472610 + ... + 1487563.

It is an arithmetic number, because the mean of its divisors is an integer number (5534045293).

Almost surely, 2^22133213521 is an apocalyptic number.

It is an amenable number.

22133213521 is a deficient number, since it is larger than the sum of its proper divisors (2967651).

22133213521 is an equidigital number, since it uses as much as digits as its factorization.

22133213521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2967650.

The product of its digits is 2160, while the sum is 25.

Adding to 22133213521 its reverse (12531233122), we get a palindrome (34664446643).

The spelling of 22133213521 in words is "twenty-two billion, one hundred thirty-three million, two hundred thirteen thousand, five hundred twenty-one".