21200122100121 has 16 divisors (see below), whose sum is σ = 28274150718528. Its totient is φ = 14129754436800.

The previous prime is 21200122100117. The next prime is 21200122100159. The reversal of 21200122100121 is 12100122100212.

It is not a de Polignac number, because 21200122100121 - 2² = 21200122100117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21200122100121.

It is not an unprimeable number, because it can be changed into a prime (21200122100321) 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, 466006186 + ... + 466051676.

It is an arithmetic number, because the mean of its divisors is an integer number (1767134419908).

Almost surely, 2^{21200122100121} is an apocalyptic number.

It is an amenable number.

21200122100121 is a deficient number, since it is larger than the sum of its proper divisors (7074028618407).

21200122100121 is a wasteful number, since it uses less digits than its factorization.

21200122100121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82312.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21200122100121 its reverse (12100122100212), we get a palindrome (33300244200333).

Subtracting from 21200122100121 its reverse (12100122100212), we obtain a palindrome (9099999999909).

The spelling of 21200122100121 in words is "twenty-one trillion, two hundred billion, one hundred twenty-two million, one hundred thousand, one hundred twenty-one".