201121321 has 4 divisors (see below), whose sum is σ = 201405700. Its totient is φ = 200836944.

The previous prime is 201121309. The next prime is 201121369. The reversal of 201121321 is 123121102.

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 38303721 + 162817600 = 6189^2 + 12760^2 .

It is a cyclic number.

It is not a de Polignac number, because 201121321 - 2¹¹ = 201119273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201121301) 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, 141126 + ... + 142543.

It is an arithmetic number, because the mean of its divisors is an integer number (50351425).

Almost surely, 2^201121321 is an apocalyptic number.

It is an amenable number.

201121321 is a deficient number, since it is larger than the sum of its proper divisors (284379).

201121321 is an equidigital number, since it uses as much as digits as its factorization.

201121321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284378.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 201121321 is about 14181.7248950895. The cubic root of 201121321 is about 585.8944322872.

Adding to 201121321 its reverse (123121102), we get a palindrome (324242423).

It can be divided in two parts, 2011 and 21321, that added together give a palindrome (23332).

The spelling of 201121321 in words is "two hundred one million, one hundred twenty-one thousand, three hundred twenty-one".