221001321 has 8 divisors (see below), whose sum is σ = 294942400. Its totient is φ = 147197232.

The previous prime is 221001311. The next prime is 221001337. The reversal of 221001321 is 123100122.

221001321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a de Polignac number, because none of the positive numbers 2^k-221001321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221001297 and 221001306.

It is not an unprimeable number, because it can be changed into a prime (221001311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30421 + ... + 36978.

It is an arithmetic number, because the mean of its divisors is an integer number (36867800).

Almost surely, 2^221001321 is an apocalyptic number.

It is an amenable number.

221001321 is a deficient number, since it is larger than the sum of its proper divisors (73941079).

221001321 is a wasteful number, since it uses less digits than its factorization.

221001321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68495.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 221001321 is about 14866.1131772902. The cubic root of 221001321 is about 604.5955642280.

Adding to 221001321 its reverse (123100122), we get a palindrome (344101443).

The spelling of 221001321 in words is "two hundred twenty-one million, one thousand, three hundred twenty-one".