22122431221 has 4 divisors (see below), whose sum is σ = 24133561344. Its totient is φ = 20111301100.

The previous prime is 22122431183. The next prime is 22122431299. The reversal of 22122431221 is 12213422122.

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 not a de Polignac number, because 22122431221 - 2²¹ = 22120334069 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22122431192 and 22122431201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22122431521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1005565045 + ... + 1005565066.

It is an arithmetic number, because the mean of its divisors is an integer number (6033390336).

Almost surely, 2^22122431221 is an apocalyptic number.

It is an amenable number.

22122431221 is a deficient number, since it is larger than the sum of its proper divisors (2011130123).

22122431221 is a wasteful number, since it uses less digits than its factorization.

22122431221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2011130122.

The product of its digits is 768, while the sum is 22.

Adding to 22122431221 its reverse (12213422122), we get a palindrome (34335853343).

Subtracting from 22122431221 its reverse (12213422122), we obtain a palindrome (9909009099).

The spelling of 22122431221 in words is "twenty-two billion, one hundred twenty-two million, four hundred thirty-one thousand, two hundred twenty-one".