12215106520 has 16 divisors (see below), whose sum is σ = 27483989760. Its totient is φ = 4886042592.

The previous prime is 12215106499. The next prime is 12215106521. The reversal of 12215106520 is 2560151221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12215106521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152688792 + ... + 152688871.

It is an arithmetic number, because the mean of its divisors is an integer number (1717749360).

Almost surely, 2^12215106520 is an apocalyptic number.

12215106520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12215106520 is an abundant number, since it is smaller than the sum of its proper divisors (15268883240).

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

12215106520 is a wasteful number, since it uses less digits than its factorization.

12215106520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305377674 (or 305377670 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 25.

Adding to 12215106520 its reverse (2560151221), we get a palindrome (14775257741).

The spelling of 12215106520 in words is "twelve billion, two hundred fifteen million, one hundred six thousand, five hundred twenty".