221232433221 has 32 divisors (see below), whose sum is σ = 334632144000. Its totient is φ = 144421190784.

The previous prime is 221232433183. The next prime is 221232433237. The reversal of 221232433221 is 122334232122.

221232433221 is a `hidden beast` number, since 2 + 2 + 1 + 2 + 3 + 2 + 433 + 221 = 666.

It is not a de Polignac number, because 221232433221 - 2⁶ = 221232433157 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221232433241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 129786 + ... + 677723.

It is an arithmetic number, because the mean of its divisors is an integer number (10457254500).

Almost surely, 2^221232433221 is an apocalyptic number.

It is an amenable number.

221232433221 is a deficient number, since it is larger than the sum of its proper divisors (113399710779).

221232433221 is a wasteful number, since it uses less digits than its factorization.

221232433221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807730 (or 807724 counting only the distinct ones).

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

Adding to 221232433221 its reverse (122334232122), we get a palindrome (343566665343).

The spelling of 221232433221 in words is "two hundred twenty-one billion, two hundred thirty-two million, four hundred thirty-three thousand, two hundred twenty-one".