21100102099999 has 4 divisors (see below), whose sum is σ = 22723186876936. Its totient is φ = 19477017323064.

The previous prime is 21100102099997. The next prime is 21100102100003. The reversal of 21100102099999 is 99999020100112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21100102099999 - 2¹ = 21100102099997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100102099997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 811542388449 + ... + 811542388474.

It is an arithmetic number, because the mean of its divisors is an integer number (5680796719234).

Almost surely, 2^{21100102099999} is an apocalyptic number.

21100102099999 is a deficient number, since it is larger than the sum of its proper divisors (1623084776937).

21100102099999 is a wasteful number, since it uses less digits than its factorization.

21100102099999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1623084776936.

The product of its (nonzero) digits is 236196, while the sum is 52.

The spelling of 21100102099999 in words is "twenty-one trillion, one hundred billion, one hundred two million, ninety-nine thousand, nine hundred ninety-nine".