21111002001200 has 60 divisors (see below), whose sum is σ = 50736912839568. Its totient is φ = 8441448787200.

The previous prime is 21111002001137. The next prime is 21111002001203. The reversal of 21111002001200 is 210020011112.

It is not an unprimeable number, because it can be changed into a prime (21111002001203) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8079212 + ... + 10368011.

Almost surely, 2^{21111002001200} is an apocalyptic number.

21111002001200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21111002001200 is an abundant number, since it is smaller than the sum of its proper divisors (29625910838368).

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

21111002001200 is a wasteful number, since it uses less digits than its factorization.

21111002001200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18450102 (or 18450091 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21111002001200 its reverse (210020011112), we get a palindrome (21321022012312).

The spelling of 21111002001200 in words is "twenty-one trillion, one hundred eleven billion, two million, one thousand, two hundred".