12001440243 has 32 divisors (see below), whose sum is σ = 18071403840. Its totient is φ = 7033098240.

The previous prime is 12001440197. The next prime is 12001440277. The reversal of 12001440243 is 34204410021.

It is not a de Polignac number, because 12001440243 - 2⁸ = 12001439987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12001444243) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9883 + ... + 155243.

It is an arithmetic number, because the mean of its divisors is an integer number (564731370).

Almost surely, 2^12001440243 is an apocalyptic number.

12001440243 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

12001440243 is a deficient number, since it is larger than the sum of its proper divisors (6069963597).

12001440243 is a wasteful number, since it uses less digits than its factorization.

12001440243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145479.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 12001440243 its reverse (34204410021), we get a palindrome (46205850264).

The spelling of 12001440243 in words is "twelve billion, one million, four hundred forty thousand, two hundred forty-three".