221432230402321 has 4 divisors (see below), whose sum is σ = 223715036901412. Its totient is φ = 219149423903232.

The previous prime is 221432230402289. The next prime is 221432230402381. The reversal of 221432230402321 is 123204032234122.

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 89013356526721 + 132418873875600 = 9434689^2 + 11507340^2 .

It is a cyclic number.

It is not a de Polignac number, because 221432230402321 - 2⁵ = 221432230402289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221432230402381) 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 3 ways as a sum of consecutive naturals, for example, 1141403249400 + ... + 1141403249593.

It is an arithmetic number, because the mean of its divisors is an integer number (55928759225353).

Almost surely, 2^{221432230402321} is an apocalyptic number.

It is an amenable number.

221432230402321 is a deficient number, since it is larger than the sum of its proper divisors (2282806499091).

221432230402321 is an equidigital number, since it uses as much as digits as its factorization.

221432230402321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2282806499090.

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

Adding to 221432230402321 its reverse (123204032234122), we get a palindrome (344636262636443).

The spelling of 221432230402321 in words is "two hundred twenty-one trillion, four hundred thirty-two billion, two hundred thirty million, four hundred two thousand, three hundred twenty-one".