21100200001000 has 64 divisors (see below), whose sum is σ = 49670123892480. Its totient is φ = 8389540532800.

The previous prime is 21100200000947. The next prime is 21100200001009. The reversal of 21100200001000 is 10000200112.

It is not an unprimeable number, because it can be changed into a prime (21100200001009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63007252 + ... + 63341251.

It is an arithmetic number, because the mean of its divisors is an integer number (776095685820).

Almost surely, 2^{21100200001000} is an apocalyptic number.

21100200001000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21100200001000 is an abundant number, since it is smaller than the sum of its proper divisors (28569923891480).

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

21100200001000 is a wasteful number, since it uses less digits than its factorization.

21100200001000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126348691 (or 126348677 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 21100200001000 its reverse (10000200112), we get a palindrome (21110200201112).

The spelling of 21100200001000 in words is "twenty-one trillion, one hundred billion, two hundred million, one thousand".