21222111210212 has 12 divisors (see below), whose sum is σ = 40514939583216. Its totient is φ = 9646414186440.

The previous prime is 21222111210211. The next prime is 21222111210217. The reversal of 21222111210212 is 21201211122212.

It is not an unprimeable number, because it can be changed into a prime (21222111210211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 241160354618 + ... + 241160354705.

It is an arithmetic number, because the mean of its divisors is an integer number (3376244965268).

Almost surely, 2^{21222111210212} is an apocalyptic number.

21222111210212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21222111210212 is a deficient number, since it is larger than the sum of its proper divisors (19292828373004).

21222111210212 is a wasteful number, since it uses less digits than its factorization.

21222111210212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482320709338 (or 482320709336 counting only the distinct ones).

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

Adding to 21222111210212 its reverse (21201211122212), we get a palindrome (42423322332424).

The spelling of 21222111210212 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred eleven million, two hundred ten thousand, two hundred twelve".