22143242221 has 4 divisors (see below), whose sum is σ = 22455118944. Its totient is φ = 21831365500.

The previous prime is 22143242213. The next prime is 22143242227. The reversal of 22143242221 is 12224234122.

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 22143242221 - 2³ = 22143242213 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 (22143242227) 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, 155938255 + ... + 155938396.

It is an arithmetic number, because the mean of its divisors is an integer number (5613779736).

Almost surely, 2^22143242221 is an apocalyptic number.

It is an amenable number.

22143242221 is a deficient number, since it is larger than the sum of its proper divisors (311876723).

22143242221 is an equidigital number, since it uses as much as digits as its factorization.

22143242221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311876722.

The product of its digits is 3072, while the sum is 25.

Adding to 22143242221 its reverse (12224234122), we get a palindrome (34367476343).

The spelling of 22143242221 in words is "twenty-two billion, one hundred forty-three million, two hundred forty-two thousand, two hundred twenty-one".