21200000121200 has 60 divisors (see below), whose sum is σ = 50942220910320. Its totient is φ = 8478464878080.

The previous prime is 21200000121187. The next prime is 21200000121221. The reversal of 21200000121200 is 212100000212.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2583845 + ... + 7005444.

It is an arithmetic number, because the mean of its divisors is an integer number (849037015172).

Almost surely, 2^{21200000121200} is an apocalyptic number.

21200000121200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21200000121200 is an abundant number, since it is smaller than the sum of its proper divisors (29742220789120).

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

21200000121200 is a wasteful number, since it uses less digits than its factorization.

21200000121200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9594834 (or 9594823 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21200000121200 its reverse (212100000212), we get a palindrome (21412100121412).

The spelling of 21200000121200 in words is "twenty-one trillion, two hundred billion, one hundred twenty-one thousand, two hundred".