12221535 has 16 divisors (see below), whose sum is σ = 19924704. Its totient is φ = 6394752.

The previous prime is 12221527. The next prime is 12221543. The reversal of 12221535 is 53512221.

It is an interprime number because it is at equal distance from previous prime (12221527) and next prime (12221543).

It is not a de Polignac number, because 12221535 - 2³ = 12221527 is a prime.

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, 6892 + ... + 8481.

It is an arithmetic number, because the mean of its divisors is an integer number (1245294).

Almost surely, 2^12221535 is an apocalyptic number.

12221535 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12221535 is a deficient number, since it is larger than the sum of its proper divisors (7703169).

12221535 is a wasteful number, since it uses less digits than its factorization.

12221535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15434.

The product of its digits is 600, while the sum is 21.

The square root of 12221535 is about 3495.9312064170. The cubic root of 12221535 is about 230.3431236500.

Adding to 12221535 its reverse (53512221), we get a palindrome (65733756).

The spelling of 12221535 in words is "twelve million, two hundred twenty-one thousand, five hundred thirty-five".