221135321 has 8 divisors (see below), whose sum is σ = 243139584. Its totient is φ = 199447920.

The previous prime is 221135311. The next prime is 221135339. The reversal of 221135321 is 123531122.

221135321 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 cyclic number.

It is not a de Polignac number, because 221135321 - 2¹⁰ = 221134297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221135293 and 221135302.

It is not an unprimeable number, because it can be changed into a prime (221135311) 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, 77750 + ... + 80543.

It is an arithmetic number, because the mean of its divisors is an integer number (30392448).

Almost surely, 2^221135321 is an apocalyptic number.

It is an amenable number.

221135321 is a deficient number, since it is larger than the sum of its proper divisors (22004263).

221135321 is a wasteful number, since it uses less digits than its factorization.

221135321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158431.

The product of its digits is 360, while the sum is 20.

The square root of 221135321 is about 14870.6193885796. The cubic root of 221135321 is about 604.7177345943.

Adding to 221135321 its reverse (123531122), we get a palindrome (344666443).

The spelling of 221135321 in words is "two hundred twenty-one million, one hundred thirty-five thousand, three hundred twenty-one".