21112001121200 has 120 divisors (see below), whose sum is σ = 55496831360880. Its totient is φ = 7654310092800.

The previous prime is 21112001121191. The next prime is 21112001121217. The reversal of 21112001121200 is 212110021112.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5636165 + ... + 8601764.

It is an arithmetic number, because the mean of its divisors is an integer number (462473594674).

Almost surely, 2^{21112001121200} is an apocalyptic number.

21112001121200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21112001121200 is an abundant number, since it is smaller than the sum of its proper divisors (34384830239680).

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

21112001121200 is a wasteful number, since it uses less digits than its factorization.

21112001121200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14238295 (or 14238284 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21112001121200 its reverse (212110021112), we get a palindrome (21324111142312).

The spelling of 21112001121200 in words is "twenty-one trillion, one hundred twelve billion, one million, one hundred twenty-one thousand, two hundred".