10306221 has 12 divisors (see below), whose sum is σ = 14017248. Its totient is φ = 6735664.

The previous prime is 10306217. The next prime is 10306243. The reversal of 10306221 is 12260301.

10306221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 10306221 - 2² = 10306217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 10306221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10306271) 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, 7816 + ... + 9038.

It is an arithmetic number, because the mean of its divisors is an integer number (1168104).

Almost surely, 2^10306221 is an apocalyptic number.

It is an amenable number.

10306221 is a deficient number, since it is larger than the sum of its proper divisors (3711027).

10306221 is an equidigital number, since it uses as much as digits as its factorization.

10306221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1332 (or 1279 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 10306221 is about 3210.3303568325. The cubic root of 10306221 is about 217.6205066120.

Adding to 10306221 its reverse (12260301), we get a palindrome (22566522).

The spelling of 10306221 in words is "ten million, three hundred six thousand, two hundred twenty-one".