22212421221 has 12 divisors (see below), whose sum is σ = 31461192992. Its totient is φ = 13937204928.

The previous prime is 22212421117. The next prime is 22212421237. The reversal of 22212421221 is 12212421222.

It is not a de Polignac number, because 22212421221 - 2¹⁵ = 22212388453 is a prime.

It is a super-2 number, since 2×22212421221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22212421921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12809065 + ... + 12810798.

Almost surely, 2^22212421221 is an apocalyptic number.

It is an amenable number.

22212421221 is a deficient number, since it is larger than the sum of its proper divisors (9248771771).

22212421221 is a wasteful number, since it uses less digits than its factorization.

22212421221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25619900 (or 25619883 counting only the distinct ones).

The product of its digits is 512, while the sum is 21.

Adding to 22212421221 its reverse (12212421222), we get a palindrome (34424842443).

Subtracting from 22212421221 its reverse (12212421222), we obtain a palindrome (9999999999).

The spelling of 22212421221 in words is "twenty-two billion, two hundred twelve million, four hundred twenty-one thousand, two hundred twenty-one".