21101112200121 has 16 divisors (see below), whose sum is σ = 28908983208000. Its totient is φ = 13680686939328.

The previous prime is 21101112200089. The next prime is 21101112200123. The reversal of 21101112200121 is 12100221110112.

It is a happy number.

It is not a de Polignac number, because 21101112200121 - 2⁵ = 21101112200089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21101112200121.

It is not an unprimeable number, because it can be changed into a prime (21101112200123) 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, 45050506 + ... + 45516483.

It is an arithmetic number, because the mean of its divisors is an integer number (1806811450500).

Almost surely, 2^{21101112200121} is an apocalyptic number.

It is an amenable number.

21101112200121 is a deficient number, since it is larger than the sum of its proper divisors (7807871007879).

21101112200121 is a wasteful number, since it uses less digits than its factorization.

21101112200121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90569128.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21101112200121 its reverse (12100221110112), we get a palindrome (33201333310233).

The spelling of 21101112200121 in words is "twenty-one trillion, one hundred one billion, one hundred twelve million, two hundred thousand, one hundred twenty-one".