12221500 has 24 divisors (see below), whose sum is σ = 26692848. Its totient is φ = 4888400.

The previous prime is 12221497. The next prime is 12221519. The reversal of 12221500 is 512221.

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, 11722 + ... + 12721.

It is an arithmetic number, because the mean of its divisors is an integer number (1112202).

Almost surely, 2^12221500 is an apocalyptic number.

12221500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12221500 is an abundant number, since it is smaller than the sum of its proper divisors (14471348).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12221500 is a wasteful number, since it uses less digits than its factorization.

12221500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24462 (or 24450 counting only the distinct ones).

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

The square root of 12221500 is about 3495.9262005941. The cubic root of 12221500 is about 230.3429037644.

Adding to 12221500 its reverse (512221), we get a palindrome (12733721).

It can be divided in two parts, 12221 and 500, that added together give a palindrome (12721).

The spelling of 12221500 in words is "twelve million, two hundred twenty-one thousand, five hundred".