21222120202012 has 12 divisors (see below), whose sum is σ = 37409795831520. Its totient is φ = 10533607107296.

The previous prime is 21222120202007. The next prime is 21222120202037. The reversal of 21222120202012 is 21020202122212.

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, 19363247812 + ... + 19363248907.

It is an arithmetic number, because the mean of its divisors is an integer number (3117482985960).

Almost surely, 2^{21222120202012} is an apocalyptic number.

It is an amenable number.

21222120202012 is a deficient number, since it is larger than the sum of its proper divisors (16187675629508).

21222120202012 is a wasteful number, since it uses less digits than its factorization.

21222120202012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38726496860 (or 38726496858 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21222120202012 its reverse (21020202122212), we get a palindrome (42242322324224).

The spelling of 21222120202012 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty million, two hundred two thousand, twelve".