21002212211212 has 6 divisors (see below), whose sum is σ = 36753871369628. Its totient is φ = 10501106105604.

The previous prime is 21002212211171. The next prime is 21002212211213. The reversal of 21002212211212 is 21211221220012.

It is a self number, because there is not a number n which added to its sum of digits gives 21002212211212.

It is not an unprimeable number, because it can be changed into a prime (21002212211213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2625276526398 + ... + 2625276526405.

Almost surely, 2^{21002212211212} is an apocalyptic number.

It is an amenable number.

21002212211212 is a deficient number, since it is larger than the sum of its proper divisors (15751659158416).

21002212211212 is a wasteful number, since it uses less digits than its factorization.

21002212211212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5250553052807 (or 5250553052805 counting only the distinct ones).

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

Adding to 21002212211212 its reverse (21211221220012), we get a palindrome (42213433431224).

The spelling of 21002212211212 in words is "twenty-one trillion, two billion, two hundred twelve million, two hundred eleven thousand, two hundred twelve".