21101020001200 has 60 divisors (see below), whose sum is σ = 51554441297880. Its totient is φ = 8297350228480.

The previous prime is 21101020001177. The next prime is 21101020001291. The reversal of 21101020001200 is 210002010112.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 447031909 + ... + 447079108.

It is an arithmetic number, because the mean of its divisors is an integer number (859240688298).

Almost surely, 2^{21101020001200} is an apocalyptic number.

21101020001200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21101020001200 is an abundant number, since it is smaller than the sum of its proper divisors (30453421296680).

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

21101020001200 is a wasteful number, since it uses less digits than its factorization.

21101020001200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 894111094 (or 894111083 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21101020001200 its reverse (210002010112), we get a palindrome (21311022011312).

The spelling of 21101020001200 in words is "twenty-one trillion, one hundred one billion, twenty million, one thousand, two hundred".