21100200121111 has 8 divisors (see below), whose sum is σ = 21298303119744. Its totient is φ = 20902113879480.

The previous prime is 21100200121109. The next prime is 21100200121163. The reversal of 21100200121111 is 11112100200112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21100200121111 - 2¹ = 21100200121109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21100200121091 and 21100200121100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100200121171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1651875 + ... + 6702916.

It is an arithmetic number, because the mean of its divisors is an integer number (2662287889968).

Almost surely, 2^{21100200121111} is an apocalyptic number.

21100200121111 is a deficient number, since it is larger than the sum of its proper divisors (198102998633).

21100200121111 is a wasteful number, since it uses less digits than its factorization.

21100200121111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8378501.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21100200121111 its reverse (11112100200112), we get a palindrome (32212300321223).

The spelling of 21100200121111 in words is "twenty-one trillion, one hundred billion, two hundred million, one hundred twenty-one thousand, one hundred eleven".