221644024001 has 4 divisors (see below), whose sum is σ = 225825986772. Its totient is φ = 217462061232.

The previous prime is 221644023989. The next prime is 221644024033. The reversal of 221644024001 is 100420446122.

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 63698188225 + 157945835776 = 252385^2 + 397424^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221644024001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221644024061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2090981306 + ... + 2090981411.

It is an arithmetic number, because the mean of its divisors is an integer number (56456496693).

Almost surely, 2^221644024001 is an apocalyptic number.

It is an amenable number.

221644024001 is a deficient number, since it is larger than the sum of its proper divisors (4181962771).

221644024001 is an equidigital number, since it uses as much as digits as its factorization.

221644024001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4181962770.

The product of its (nonzero) digits is 3072, while the sum is 26.

The spelling of 221644024001 in words is "two hundred twenty-one billion, six hundred forty-four million, twenty-four thousand, one".