115221 has 8 divisors (see below), whose sum is σ = 155200. Its totient is φ = 76032.

The previous prime is 115211. The next prime is 115223. The reversal of 115221 is 122511.

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

It is not a de Polignac number, because 115221 - 2¹⁰ = 114197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 115197 and 115206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 480 + ... + 678.

It is an arithmetic number, because the mean of its divisors is an integer number (19400).

2¹¹⁵²²¹ is an apocalyptic number.

It is an amenable number.

115221 is a deficient number, since it is larger than the sum of its proper divisors (39979).

115221 is a wasteful number, since it uses less digits than its factorization.

115221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395.

The product of its digits is 20, while the sum is 12.

The square root of 115221 is about 339.4421894815. The cubic root of 115221 is about 48.6605724109.

Adding to 115221 its reverse (122511), we get a palindrome (237732).

The spelling of 115221 in words is "one hundred fifteen thousand, two hundred twenty-one".