221200112121 has 8 divisors (see below), whose sum is σ = 294951621120. Its totient is φ = 147457672272.

The previous prime is 221200112099. The next prime is 221200112141. The reversal of 221200112121 is 121211002122.

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

It is not a de Polignac number, because 221200112121 - 2⁹ = 221200111609 is a prime.

It is a super-2 number, since 2×221200112121² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221200112121.

It is not an unprimeable number, because it can be changed into a prime (221200112141) 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, 2210170 + ... + 2308083.

It is an arithmetic number, because the mean of its divisors is an integer number (36868952640).

Almost surely, 2^221200112121 is an apocalyptic number.

It is an amenable number.

221200112121 is a deficient number, since it is larger than the sum of its proper divisors (73751508999).

221200112121 is a wasteful number, since it uses less digits than its factorization.

221200112121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4534575.

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

Adding to 221200112121 its reverse (121211002122), we get a palindrome (342411114243).

The spelling of 221200112121 in words is "two hundred twenty-one billion, two hundred million, one hundred twelve thousand, one hundred twenty-one".