22121443231 has 4 divisors (see below), whose sum is σ = 22220642752. Its totient is φ = 22022243712.

The previous prime is 22121443229. The next prime is 22121443241. The reversal of 22121443231 is 13234412122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 22121443231 - 2¹ = 22121443229 is a prime.

It is a super-2 number, since 2×22121443231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22121443196 and 22121443205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121443241) 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, 49599426 + ... + 49599871.

It is an arithmetic number, because the mean of its divisors is an integer number (5555160688).

Almost surely, 2^22121443231 is an apocalyptic number.

22121443231 is a deficient number, since it is larger than the sum of its proper divisors (99199521).

22121443231 is an equidigital number, since it uses as much as digits as its factorization.

22121443231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99199520.

The product of its digits is 2304, while the sum is 25.

Adding to 22121443231 its reverse (13234412122), we get a palindrome (35355855353).

The spelling of 22121443231 in words is "twenty-two billion, one hundred twenty-one million, four hundred forty-three thousand, two hundred thirty-one".