21200021100012 has 48 divisors (see below), whose sum is σ = 50074548330240. Its totient is φ = 6979880795328.

The previous prime is 21200021100007. The next prime is 21200021100023. The reversal of 21200021100012 is 21000112000212.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1695513 + ... + 6728655.

It is an arithmetic number, because the mean of its divisors is an integer number (1043219756880).

Almost surely, 2^{21200021100012} is an apocalyptic number.

It is an amenable number.

21200021100012 is an abundant number, since it is smaller than the sum of its proper divisors (28874527230228).

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

21200021100012 is a wasteful number, since it uses less digits than its factorization.

21200021100012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5037462 (or 5037460 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21200021100012 its reverse (21000112000212), we get a palindrome (42200133100224).

The spelling of 21200021100012 in words is "twenty-one trillion, two hundred billion, twenty-one million, one hundred thousand, twelve".