10221215 has 4 divisors (see below), whose sum is σ = 12265464. Its totient is φ = 8176968.

The previous prime is 10221203. The next prime is 10221247. The reversal of 10221215 is 51212201.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 10221215 - 2⁶ = 10221151 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 10221215.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1022117 + ... + 1022126.

It is an arithmetic number, because the mean of its divisors is an integer number (3066366).

Almost surely, 2^10221215 is an apocalyptic number.

10221215 is a deficient number, since it is larger than the sum of its proper divisors (2044249).

10221215 is an equidigital number, since it uses as much as digits as its factorization.

10221215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2044248.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 10221215 is about 3197.0634963979. The cubic root of 10221215 is about 217.0205407160.

Adding to 10221215 its reverse (51212201), we get a palindrome (61433416).

The spelling of 10221215 in words is "ten million, two hundred twenty-one thousand, two hundred fifteen".