221332233121 has 4 divisors (see below), whose sum is σ = 222817684500. Its totient is φ = 219846781744.

The previous prime is 221332233053. The next prime is 221332233131. The reversal of 221332233121 is 121332233122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19061668096 + 202270565025 = 138064^2 + 449745^2 .

It is a cyclic number.

It is not a de Polignac number, because 221332233121 - 2¹³ = 221332224929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221332233131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 742725466 + ... + 742725763.

It is an arithmetic number, because the mean of its divisors is an integer number (55704421125).

Almost surely, 2^221332233121 is an apocalyptic number.

It is an amenable number.

221332233121 is a deficient number, since it is larger than the sum of its proper divisors (1485451379).

221332233121 is a wasteful number, since it uses less digits than its factorization.

221332233121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1485451378.

The product of its digits is 2592, while the sum is 25.

Adding to 221332233121 its reverse (121332233122), we get a palindrome (342664466243).

Subtracting from 221332233121 its reverse (121332233122), we obtain a palindrome (99999999999).

The spelling of 221332233121 in words is "two hundred twenty-one billion, three hundred thirty-two million, two hundred thirty-three thousand, one hundred twenty-one".