221200012121 has 8 divisors (see below), whose sum is σ = 244216443744. Its totient is φ = 198668137120.

The previous prime is 221200012109. The next prime is 221200012129. The reversal of 221200012121 is 121210002122.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221200012121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221200012096 and 221200012105.

It is not an unprimeable number, because it can be changed into a prime (221200012129) 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, 121138196 + ... + 121140021.

It is an arithmetic number, because the mean of its divisors is an integer number (30527055468).

Almost surely, 2^221200012121 is an apocalyptic number.

It is an amenable number.

221200012121 is a deficient number, since it is larger than the sum of its proper divisors (23016431623).

221200012121 is a wasteful number, since it uses less digits than its factorization.

221200012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242278311.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 221200012121 its reverse (121210002122), we get a palindrome (342410014243).

Subtracting from 221200012121 its reverse (121210002122), we obtain a palindrome (99990009999).

It can be divided in two parts, 22120001 and 2121, that added together give a palindrome (22122122).

The spelling of 221200012121 in words is "two hundred twenty-one billion, two hundred million, twelve thousand, one hundred twenty-one".