21002202122212 has 12 divisors (see below), whose sum is σ = 36754318572160. Its totient is φ = 10500968244456.

The previous prime is 21002202122179. The next prime is 21002202122249. The reversal of 21002202122212 is 21222120220012.

It is a self number, because there is not a number n which added to its sum of digits gives 21002202122212.

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, 32847948 + ... + 33481219.

Almost surely, 2^{21002202122212} is an apocalyptic number.

It is an amenable number.

21002202122212 is a deficient number, since it is larger than the sum of its proper divisors (15752116449948).

21002202122212 is a wasteful number, since it uses less digits than its factorization.

21002202122212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66408330 (or 66408328 counting only the distinct ones).

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

Adding to 21002202122212 its reverse (21222120220012), we get a palindrome (42224322342224).

The spelling of 21002202122212 in words is "twenty-one trillion, two billion, two hundred two million, one hundred twenty-two thousand, two hundred twelve".