221001140321 has 4 divisors (see below), whose sum is σ = 238001228052. Its totient is φ = 204001052592.

The previous prime is 221001140281. The next prime is 221001140323. The reversal of 221001140321 is 123041100122.

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 31309533025 + 189691607296 = 176945^2 + 435536^2 .

It is a cyclic number.

It is not a de Polignac number, because 221001140321 - 2⁶ = 221001140257 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221001140321.

It is not an unprimeable number, because it can be changed into a prime (221001140323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8500043846 + ... + 8500043871.

It is an arithmetic number, because the mean of its divisors is an integer number (59500307013).

Almost surely, 2^221001140321 is an apocalyptic number.

It is an amenable number.

221001140321 is a deficient number, since it is larger than the sum of its proper divisors (17000087731).

221001140321 is a wasteful number, since it uses less digits than its factorization.

221001140321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17000087730.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 221001140321 its reverse (123041100122), we get a palindrome (344042240443).

The spelling of 221001140321 in words is "two hundred twenty-one billion, one million, one hundred forty thousand, three hundred twenty-one".