115221001 has 12 divisors (see below), whose sum is σ = 135924480. Its totient is φ = 97366920.

The previous prime is 115220999. The next prime is 115221011. The reversal of 115221001 is 100122511.

It is not a de Polignac number, because 115221001 - 2¹ = 115220999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (115221011) 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, 13081 + ... + 20038.

It is an arithmetic number, because the mean of its divisors is an integer number (11327040).

Almost surely, 2^115221001 is an apocalyptic number.

It is an amenable number.

115221001 is a deficient number, since it is larger than the sum of its proper divisors (20703479).

115221001 is an equidigital number, since it uses as much as digits as its factorization.

115221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33204 (or 33197 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 13.

The square root of 115221001 is about 10734.1045737407. The cubic root of 115221001 is about 486.6057255169.

Adding to 115221001 its reverse (100122511), we get a palindrome (215343512).

The spelling of 115221001 in words is "one hundred fifteen million, two hundred twenty-one thousand, one".