215341321 has 6 divisors (see below), whose sum is σ = 233180430. Its totient is φ = 198776448.

The previous prime is 215341309. The next prime is 215341331. The reversal of 215341321 is 123143512.

It is a happy number.

215341321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 6943225 + 208398096 = 2635^2 + 14436^2 .

It is not a de Polignac number, because 215341321 - 2⁵ = 215341289 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 215341292 and 215341301.

It is not an unprimeable number, because it can be changed into a prime (215341331) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 636936 + ... + 637273.

It is an arithmetic number, because the mean of its divisors is an integer number (38863405).

Almost surely, 2^215341321 is an apocalyptic number.

It is an amenable number.

215341321 is a deficient number, since it is larger than the sum of its proper divisors (17839109).

215341321 is a wasteful number, since it uses less digits than its factorization.

215341321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1274235 (or 1274222 counting only the distinct ones).

The product of its digits is 720, while the sum is 22.

The square root of 215341321 is about 14674.5126324522. The cubic root of 215341321 is about 599.3894910458.

Adding to 215341321 its reverse (123143512), we get a palindrome (338484833).

The spelling of 215341321 in words is "two hundred fifteen million, three hundred forty-one thousand, three hundred twenty-one".