12215342500 has 30 divisors (see below), whose sum is σ = 26712516446. Its totient is φ = 4886136000.

The previous prime is 12215342479. The next prime is 12215342539. The reversal of 12215342500 is 524351221.

It can be written as a sum of positive squares in 5 ways, for example, as 2203739136 + 10011603364 = 46944^2 + 100058^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2440569 + ... + 2445568.

Almost surely, 2^12215342500 is an apocalyptic number.

12215342500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12215342500 is an abundant number, since it is smaller than the sum of its proper divisors (14497173946).

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

12215342500 is an equidigital number, since it uses as much as digits as its factorization.

12215342500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4886161 (or 4886144 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 12215342500 its reverse (524351221), we get a palindrome (12739693721).

The spelling of 12215342500 in words is "twelve billion, two hundred fifteen million, three hundred forty-two thousand, five hundred".