21212232222 has 32 divisors (see below), whose sum is σ = 45195639552. Its totient is φ = 6613985664.

The previous prime is 21212232211. The next prime is 21212232253. The reversal of 21212232222 is 22223221212.

It is a super-3 number, since 3×21212232222³ (a number of 32 digits) contains 333 as substring.

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 15 ways as a sum of consecutive naturals, for example, 621298 + ... + 654549.

It is an arithmetic number, because the mean of its divisors is an integer number (1412363736).

Almost surely, 2^21212232222 is an apocalyptic number.

21212232222 is an abundant number, since it is smaller than the sum of its proper divisors (23983407330).

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

21212232222 is a wasteful number, since it uses less digits than its factorization.

21212232222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1276032.

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

Adding to 21212232222 its reverse (22223221212), we get a palindrome (43435453434).

The spelling of 21212232222 in words is "twenty-one billion, two hundred twelve million, two hundred thirty-two thousand, two hundred twenty-two".