21102120200001 has 24 divisors (see below), whose sum is σ = 29009538201504. Its totient is φ = 13644129732480.

The previous prime is 21102120199999. The next prime is 21102120200023. The reversal of 21102120200001 is 10000202120112.

It is not a de Polignac number, because 21102120200001 - 2¹ = 21102120199999 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21102120200001.

It is not an unprimeable number, because it can be changed into a prime (21102120200041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6922315 + ... + 9493296.

It is an arithmetic number, because the mean of its divisors is an integer number (1208730758396).

Almost surely, 2^{21102120200001} is an apocalyptic number.

It is an amenable number.

21102120200001 is a deficient number, since it is larger than the sum of its proper divisors (7907418001503).

21102120200001 is a wasteful number, since it uses less digits than its factorization.

21102120200001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16416001 (or 16415964 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21102120200001 its reverse (10000202120112), we get a palindrome (31102322320113).

The spelling of 21102120200001 in words is "twenty-one trillion, one hundred two billion, one hundred twenty million, two hundred thousand, one".