221232432321 has 12 divisors (see below), whose sum is σ = 324058775040. Its totient is φ = 145410987960.

The previous prime is 221232432293. The next prime is 221232432371. The reversal of 221232432321 is 123234232122.

221232432321 is a `hidden beast` number, since 2 + 2 + 12 + 324 + 3 + 2 + 321 = 666.

It is not a de Polignac number, because 221232432321 - 2⁶ = 221232432257 is a prime.

It is a super-2 number, since 2×221232432321² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221232432371) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 173107681 + ... + 173108958.

It is an arithmetic number, because the mean of its divisors is an integer number (27004897920).

Almost surely, 2^221232432321 is an apocalyptic number.

It is an amenable number.

221232432321 is a deficient number, since it is larger than the sum of its proper divisors (102826342719).

221232432321 is a wasteful number, since it uses less digits than its factorization.

221232432321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346216716 (or 346216713 counting only the distinct ones).

The product of its digits is 6912, while the sum is 27.

Adding to 221232432321 its reverse (123234232122), we get a palindrome (344466664443).

The spelling of 221232432321 in words is "two hundred twenty-one billion, two hundred thirty-two million, four hundred thirty-two thousand, three hundred twenty-one".