22122223221 has 8 divisors (see below), whose sum is σ = 33710054464. Its totient is φ = 12641270400.

The previous prime is 22122223177. The next prime is 22122223259. The reversal of 22122223221 is 12232222122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 22122223221 - 2⁶ = 22122223157 is a prime.

It is a super-2 number, since 2×22122223221² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 1053439201 = 22122223221 / (2 + 2 + 1 + 2 + 2 + 2 + 2 + 3 + 2 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22122223271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 526719580 + ... + 526719621.

It is an arithmetic number, because the mean of its divisors is an integer number (4213756808).

Almost surely, 2^22122223221 is an apocalyptic number.

22122223221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

22122223221 is a deficient number, since it is larger than the sum of its proper divisors (11587831243).

22122223221 is a wasteful number, since it uses less digits than its factorization.

22122223221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1053439211.

The product of its digits is 768, while the sum is 21.

Adding to 22122223221 its reverse (12232222122), we get a palindrome (34354445343).

The spelling of 22122223221 in words is "twenty-two billion, one hundred twenty-two million, two hundred twenty-three thousand, two hundred twenty-one".