21200010221212 has 6 divisors (see below), whose sum is σ = 37100017887128. Its totient is φ = 10600005110604.

The previous prime is 21200010221197. The next prime is 21200010221213. The reversal of 21200010221212 is 21212201000212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200010221213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2650001277648 + ... + 2650001277655.

Almost surely, 2^{21200010221212} is an apocalyptic number.

It is an amenable number.

21200010221212 is a deficient number, since it is larger than the sum of its proper divisors (15900007665916).

21200010221212 is a wasteful number, since it uses less digits than its factorization.

21200010221212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5300002555307 (or 5300002555305 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21200010221212 its reverse (21212201000212), we get a palindrome (42412211221424).

The spelling of 21200010221212 in words is "twenty-one trillion, two hundred billion, ten million, two hundred twenty-one thousand, two hundred twelve".