221033312121 has 8 divisors (see below), whose sum is σ = 304873534080. Its totient is φ = 142274315792.

The previous prime is 221033312117. The next prime is 221033312131. The reversal of 221033312121 is 121213330122.

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

It is a cyclic number.

It is not a de Polignac number, because 221033312121 - 2² = 221033312117 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221033312131) 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, 1270306305 + ... + 1270306478.

It is an arithmetic number, because the mean of its divisors is an integer number (38109191760).

Almost surely, 2^221033312121 is an apocalyptic number.

It is an amenable number.

221033312121 is a deficient number, since it is larger than the sum of its proper divisors (83840221959).

221033312121 is a wasteful number, since it uses less digits than its factorization.

221033312121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2540612815.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 221033312121 its reverse (121213330122), we get a palindrome (342246642243).

The spelling of 221033312121 in words is "two hundred twenty-one billion, thirty-three million, three hundred twelve thousand, one hundred twenty-one".