22212231321 has 32 divisors (see below), whose sum is σ = 34968567808. Its totient is φ = 12272886720.

The previous prime is 22212231313. The next prime is 22212231407. The reversal of 22212231321 is 12313221222.

It is not a de Polignac number, because 22212231321 - 2³ = 22212231313 is a prime.

It is a super-2 number, since 2×22212231321² (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).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22212231421) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 791496 + ... + 819078.

It is an arithmetic number, because the mean of its divisors is an integer number (1092767744).

Almost surely, 2^22212231321 is an apocalyptic number.

22212231321 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

22212231321 is a deficient number, since it is larger than the sum of its proper divisors (12756336487).

22212231321 is a wasteful number, since it uses less digits than its factorization.

22212231321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28861.

The product of its digits is 576, while the sum is 21.

Adding to 22212231321 its reverse (12313221222), we get a palindrome (34525452543).

The spelling of 22212231321 in words is "twenty-two billion, two hundred twelve million, two hundred thirty-one thousand, three hundred twenty-one".