221323434421 has 32 divisors (see below), whose sum is σ = 232010956800. Its totient is φ = 210952872000.

The previous prime is 221323434389. The next prime is 221323434517. The reversal of 221323434421 is 124434323122.

It is a cyclic number.

It is not a de Polignac number, because 221323434421 - 2⁵ = 221323434389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221323434121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 299490070 + ... + 299490808.

It is an arithmetic number, because the mean of its divisors is an integer number (7250342400).

Almost surely, 2^221323434421 is an apocalyptic number.

It is an amenable number.

221323434421 is a deficient number, since it is larger than the sum of its proper divisors (10687522379).

221323434421 is a wasteful number, since it uses less digits than its factorization.

221323434421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1569.

The product of its digits is 27648, while the sum is 31.

Adding to 221323434421 its reverse (124434323122), we get a palindrome (345757757543).

The spelling of 221323434421 in words is "two hundred twenty-one billion, three hundred twenty-three million, four hundred thirty-four thousand, four hundred twenty-one".