221445402331423 has 8 divisors (see below), whose sum is σ = 223645593015936. Its totient is φ = 219246177711000.

The previous prime is 221445402331379. The next prime is 221445402331427. The reversal of 221445402331423 is 324133204544122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221445402331423 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 (221445402331427) 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 7 ways as a sum of consecutive naturals, for example, 241055293 + ... + 241972198.

It is an arithmetic number, because the mean of its divisors is an integer number (27955699126992).

Almost surely, 2^{221445402331423} is an apocalyptic number.

221445402331423 is a deficient number, since it is larger than the sum of its proper divisors (2200190684513).

221445402331423 is a wasteful number, since it uses less digits than its factorization.

221445402331423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483032045.

The product of its (nonzero) digits is 552960, while the sum is 40.

Adding to 221445402331423 its reverse (324133204544122), we get a palindrome (545578606875545).

The spelling of 221445402331423 in words is "two hundred twenty-one trillion, four hundred forty-five billion, four hundred two million, three hundred thirty-one thousand, four hundred twenty-three".