115213221 has 12 divisors (see below), whose sum is σ = 166671648. Its totient is φ = 76692264.

The previous prime is 115213193. The next prime is 115213243. The reversal of 115213221 is 122312511.

It is not a de Polignac number, because 115213221 - 2¹⁵ = 115180453 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 115213194 and 115213203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115213291) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3225 + ... + 15518.

It is an arithmetic number, because the mean of its divisors is an integer number (13889304).

Almost surely, 2^115213221 is an apocalyptic number.

It is an amenable number.

115213221 is a deficient number, since it is larger than the sum of its proper divisors (51458427).

115213221 is a wasteful number, since it uses less digits than its factorization.

115213221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19432 (or 19429 counting only the distinct ones).

The product of its digits is 120, while the sum is 18.

The square root of 115213221 is about 10733.7421713026. The cubic root of 115213221 is about 486.5947730062.

Adding to 115213221 its reverse (122312511), we get a palindrome (237525732).

The spelling of 115213221 in words is "one hundred fifteen million, two hundred thirteen thousand, two hundred twenty-one".