10015221 has 4 divisors (see below), whose sum is σ = 13353632. Its totient is φ = 6676812.

The previous prime is 10015217. The next prime is 10015231. The reversal of 10015221 is 12251001.

10015221 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 10015221 - 2² = 10015217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 10015197 and 10015206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10015211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1669201 + ... + 1669206.

It is an arithmetic number, because the mean of its divisors is an integer number (3338408).

Almost surely, 2^10015221 is an apocalyptic number.

It is an amenable number.

10015221 is a deficient number, since it is larger than the sum of its proper divisors (3338411).

10015221 is an equidigital number, since it uses as much as digits as its factorization.

10015221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3338410.

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

The square root of 10015221 is about 3164.6833964869. The cubic root of 10015221 is about 215.5527224251.

Adding to 10015221 its reverse (12251001), we get a palindrome (22266222).

The spelling of 10015221 in words is "ten million, fifteen thousand, two hundred twenty-one".