12002109978 has 32 divisors (see below), whose sum is σ = 24811402752. Its totient is φ = 3866515200.

The previous prime is 12002109971. The next prime is 12002109979. The reversal of 12002109978 is 87990120021.

It is not an unprimeable number, because it can be changed into a prime (12002109971) 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, 99150 + ... + 183942.

It is an arithmetic number, because the mean of its divisors is an integer number (775356336).

Almost surely, 2^12002109978 is an apocalyptic number.

12002109978 is an abundant number, since it is smaller than the sum of its proper divisors (12809292774).

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

12002109978 is a wasteful number, since it uses less digits than its factorization.

12002109978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85590.

The product of its (nonzero) digits is 18144, while the sum is 39.

Adding to 12002109978 its reverse (87990120021), we get a palindrome (99992229999).

The spelling of 12002109978 in words is "twelve billion, two million, one hundred nine thousand, nine hundred seventy-eight".