21222111021212 has 144 divisors (see below), whose sum is σ = 40638299135616. Its totient is φ = 9689379840000.

The previous prime is 21222111021193. The next prime is 21222111021233. The reversal of 21222111021212 is 21212011122212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9003864338 + ... + 9003866694.

It is an arithmetic number, because the mean of its divisors is an integer number (282210410664).

Almost surely, 2^{21222111021212} is an apocalyptic number.

It is an amenable number.

21222111021212 is a deficient number, since it is larger than the sum of its proper divisors (19416188114404).

21222111021212 is a wasteful number, since it uses less digits than its factorization.

21222111021212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3408 (or 3389 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 21222111021212 its reverse (21212011122212), we get a palindrome (42434122143424).

The spelling of 21222111021212 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred eleven million, twenty-one thousand, two hundred twelve".