21100100200121 has 16 divisors (see below), whose sum is σ = 22350317454720. Its totient is φ = 19850888367360.

The previous prime is 21100100200061. The next prime is 21100100200169. The reversal of 21100100200121 is 12100200100112.

It is a cyclic number.

It is not a de Polignac number, because 21100100200121 - 2²² = 21100096005817 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21100100280121) 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, 603895070 + ... + 603930008.

It is an arithmetic number, because the mean of its divisors is an integer number (1396894840920).

Almost surely, 2^{21100100200121} is an apocalyptic number.

It is an amenable number.

21100100200121 is a deficient number, since it is larger than the sum of its proper divisors (1250217254599).

21100100200121 is a wasteful number, since it uses less digits than its factorization.

21100100200121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48304.

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

Adding to 21100100200121 its reverse (12100200100112), we get a palindrome (33200300300233).

The spelling of 21100100200121 in words is "twenty-one trillion, one hundred billion, one hundred million, two hundred thousand, one hundred twenty-one".