21200021200012 has 6 divisors (see below), whose sum is σ = 37100037100028. Its totient is φ = 10600010600004.

The previous prime is 21200021200009. The next prime is 21200021200021. The reversal of 21200021200012 is 21000212000212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21200021199965 and 21200021200001.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2650002649998 + ... + 2650002650005.

Almost surely, 2^{21200021200012} is an apocalyptic number.

It is an amenable number.

21200021200012 is a deficient number, since it is larger than the sum of its proper divisors (15900015900016).

21200021200012 is a wasteful number, since it uses less digits than its factorization.

21200021200012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5300005300007 (or 5300005300005 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21200021200012 its reverse (21000212000212), we get a palindrome (42200233200224).

The spelling of 21200021200012 in words is "twenty-one trillion, two hundred billion, twenty-one million, two hundred thousand, twelve".