12215205140 has 12 divisors (see below), whose sum is σ = 25651930836. Its totient is φ = 4886082048.

The previous prime is 12215205139. The next prime is 12215205181. The reversal of 12215205140 is 4150251221.

It can be written as a sum of positive squares in 2 ways, for example, as 9629889424 + 2585315716 = 98132^2 + 50846^2 .

It is a super-2 number, since 2×12215205140² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 305380109 + ... + 305380148.

It is an arithmetic number, because the mean of its divisors is an integer number (2137660903).

Almost surely, 2^12215205140 is an apocalyptic number.

12215205140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12215205140 is an abundant number, since it is smaller than the sum of its proper divisors (13436725696).

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

12215205140 is a wasteful number, since it uses less digits than its factorization.

12215205140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610760266 (or 610760264 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 23.

Adding to 12215205140 its reverse (4150251221), we get a palindrome (16365456361).

The spelling of 12215205140 in words is "twelve billion, two hundred fifteen million, two hundred five thousand, one hundred forty".