12221005 has 16 divisors (see below), whose sum is σ = 15116544. Its totient is φ = 9480640.

The previous prime is 12220997. The next prime is 12221021. The reversal of 12221005 is 50012221.

It is not a de Polignac number, because 12221005 - 2³ = 12220997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28140 + ... + 28570.

It is an arithmetic number, because the mean of its divisors is an integer number (944784).

Almost surely, 2^12221005 is an apocalyptic number.

It is an amenable number.

12221005 is a deficient number, since it is larger than the sum of its proper divisors (2895539).

12221005 is a wasteful number, since it uses less digits than its factorization.

12221005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 596.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 12221005 is about 3495.8554031882. The cubic root of 12221005 is about 230.3397939095.

Adding to 12221005 its reverse (50012221), we get a palindrome (62233226).

The spelling of 12221005 in words is "twelve million, two hundred twenty-one thousand, five".