12221004500 has 24 divisors (see below), whose sum is σ = 26690674920. Its totient is φ = 4888401600.

The previous prime is 12221004491. The next prime is 12221004527. The reversal of 12221004500 is 540012221.

It can be written as a sum of positive squares in 4 ways, for example, as 165842884 + 12055161616 = 12878^2 + 109796^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12220505 + ... + 12221504.

It is an arithmetic number, because the mean of its divisors is an integer number (1112111455).

Almost surely, 2^12221004500 is an apocalyptic number.

12221004500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12221004500 is an abundant number, since it is smaller than the sum of its proper divisors (14469670420).

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

12221004500 is a wasteful number, since it uses less digits than its factorization.

12221004500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24442028 (or 24442016 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

Adding to 12221004500 its reverse (540012221), we get a palindrome (12761016721).

The spelling of 12221004500 in words is "twelve billion, two hundred twenty-one million, four thousand, five hundred".