21222120101212 has 48 divisors (see below), whose sum is σ = 37850698448640. Its totient is φ = 10408427120000.

The previous prime is 21222120101209. The next prime is 21222120101213. The reversal of 21222120101212 is 21210102122212.

It is a self number, because there is not a number n which added to its sum of digits gives 21222120101212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222120101213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1506496833 + ... + 1506510919.

It is an arithmetic number, because the mean of its divisors is an integer number (788556217680).

Almost surely, 2^{21222120101212} is an apocalyptic number.

It is an amenable number.

21222120101212 is a deficient number, since it is larger than the sum of its proper divisors (16628578347428).

21222120101212 is a wasteful number, since it uses less digits than its factorization.

21222120101212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27642 (or 27640 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21222120101212 its reverse (21210102122212), we get a palindrome (42432222223424).

The spelling of 21222120101212 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty million, one hundred one thousand, two hundred twelve".