21222120202212 has 96 divisors (see below), whose sum is σ = 52594203956224. Its totient is φ = 6648507993600.

The previous prime is 21222120202139. The next prime is 21222120202259. The reversal of 21222120202212 is 21220202122212.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6021318 + ... + 8871330.

Almost surely, 2^{21222120202212} is an apocalyptic number.

It is an amenable number.

21222120202212 is an abundant number, since it is smaller than the sum of its proper divisors (31372083754012).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21222120202212 is a wasteful number, since it uses less digits than its factorization.

21222120202212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2850629 (or 2850627 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 21222120202212 its reverse (21220202122212), we get a palindrome (42442322324424).

The spelling of 21222120202212 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty million, two hundred two thousand, two hundred twelve".