22131333221 has 4 divisors (see below), whose sum is σ = 22243675212. Its totient is φ = 22018991232.

The previous prime is 22131333199. The next prime is 22131333229. The reversal of 22131333221 is 12233313122.

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 20763369025 + 1367964196 = 144095^2 + 36986^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22131333221 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 (22131333229) 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, 56170700 + ... + 56171093.

It is an arithmetic number, because the mean of its divisors is an integer number (5560918803).

Almost surely, 2^22131333221 is an apocalyptic number.

It is an amenable number.

22131333221 is a deficient number, since it is larger than the sum of its proper divisors (112341991).

22131333221 is a wasteful number, since it uses less digits than its factorization.

22131333221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112341990.

The product of its digits is 1296, while the sum is 23.

Adding to 22131333221 its reverse (12233313122), we get a palindrome (34364646343).

The spelling of 22131333221 in words is "twenty-two billion, one hundred thirty-one million, three hundred thirty-three thousand, two hundred twenty-one".