21222120121012 has 12 divisors (see below), whose sum is σ = 37143995405440. Its totient is φ = 10609550005176.

The previous prime is 21222120121003. The next prime is 21222120121031. The reversal of 21222120121012 is 21012102122212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 377482212 + ... + 377538427.

Almost surely, 2^{21222120121012} is an apocalyptic number.

It is an amenable number.

21222120121012 is a deficient number, since it is larger than the sum of its proper divisors (15921875284428).

21222120121012 is a wasteful number, since it uses less digits than its factorization.

21222120121012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 755027670 (or 755027668 counting only the distinct ones).

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

Adding to 21222120121012 its reverse (21012102122212), we get a palindrome (42234222243224).

The spelling of 21222120121012 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty million, one hundred twenty-one thousand, twelve".