12215223240 has 64 divisors (see below), whose sum is σ = 39977098560. Its totient is φ = 2961265920.

The previous prime is 12215223217. The next prime is 12215223247. The reversal of 12215223240 is 4232251221.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 12215223240.

It is not an unprimeable number, because it can be changed into a prime (12215223247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4625659 + ... + 4628298.

It is an arithmetic number, because the mean of its divisors is an integer number (624642165).

Almost surely, 2^12215223240 is an apocalyptic number.

12215223240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12215223240 is an abundant number, since it is smaller than the sum of its proper divisors (27761875320).

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

12215223240 is a wasteful number, since it uses less digits than its factorization.

12215223240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9253982 (or 9253978 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

Adding to 12215223240 its reverse (4232251221), we get a palindrome (16447474461).

The spelling of 12215223240 in words is "twelve billion, two hundred fifteen million, two hundred twenty-three thousand, two hundred forty".