221234432121 has 12 divisors (see below), whose sum is σ = 319853766960. Its totient is φ = 147354427320.

The previous prime is 221234432113. The next prime is 221234432131. The reversal of 221234432121 is 121234432122.

221234432121 is a `hidden beast` number, since 2 + 2 + 1 + 2 + 3 + 443 + 212 + 1 = 666.

It is not a de Polignac number, because 221234432121 - 2³ = 221234432113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221234432131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11255811 + ... + 11275448.

It is an arithmetic number, because the mean of its divisors is an integer number (26654480580).

Almost surely, 2^221234432121 is an apocalyptic number.

It is an amenable number.

221234432121 is a deficient number, since it is larger than the sum of its proper divisors (98619334839).

221234432121 is a wasteful number, since it uses less digits than its factorization.

221234432121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22532356 (or 22532353 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

Adding to 221234432121 its reverse (121234432122), we get a palindrome (342468864243).

Subtracting from 221234432121 its reverse (121234432122), we obtain a palindrome (99999999999).

The spelling of 221234432121 in words is "two hundred twenty-one billion, two hundred thirty-four million, four hundred thirty-two thousand, one hundred twenty-one".