12221215 has 8 divisors (see below), whose sum is σ = 15528240. Its totient is φ = 9201792.

The previous prime is 12221207. The next prime is 12221233. The reversal of 12221215 is 51212221.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12221215 - 2³ = 12221207 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71805 + ... + 71974.

It is an arithmetic number, because the mean of its divisors is an integer number (1941030).

Almost surely, 2^12221215 is an apocalyptic number.

12221215 is a deficient number, since it is larger than the sum of its proper divisors (3307025).

12221215 is a wasteful number, since it uses less digits than its factorization.

12221215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143801.

The product of its digits is 80, while the sum is 16.

The square root of 12221215 is about 3495.8854386264. The cubic root of 12221215 is about 230.3411132521.

Adding to 12221215 its reverse (51212221), we get a palindrome (63433436).

The spelling of 12221215 in words is "twelve million, two hundred twenty-one thousand, two hundred fifteen".