21212313222 has 64 divisors (see below), whose sum is σ = 45222105600. Its totient is φ = 6614150400.

The previous prime is 21212313217. The next prime is 21212313251. The reversal of 21212313222 is 22231321212.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13199143 + ... + 13200749.

It is an arithmetic number, because the mean of its divisors is an integer number (706595400).

Almost surely, 2^21212313222 is an apocalyptic number.

21212313222 is an abundant number, since it is smaller than the sum of its proper divisors (24009792378).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21212313222 is a wasteful number, since it uses less digits than its factorization.

21212313222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3021.

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

Adding to 21212313222 its reverse (22231321212), we get a palindrome (43443634434).

The spelling of 21212313222 in words is "twenty-one billion, two hundred twelve million, three hundred thirteen thousand, two hundred twenty-two".