12000121988 has 24 divisors (see below), whose sum is σ = 21406132440. Its totient is φ = 5884186880.

The previous prime is 12000121981. The next prime is 12000122021. The reversal of 12000121988 is 88912100021.

It can be written as a sum of positive squares in 4 ways, for example, as 1018758724 + 10981363264 = 31918^2 + 104792^2 .

It is not an unprimeable number, because it can be changed into a prime (12000121981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 505898 + ... + 529086.

It is an arithmetic number, because the mean of its divisors is an integer number (891922185).

Almost surely, 2^12000121988 is an apocalyptic number.

It is an amenable number.

12000121988 is a deficient number, since it is larger than the sum of its proper divisors (9406010452).

12000121988 is a wasteful number, since it uses less digits than its factorization.

12000121988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25687 (or 25685 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 32.

The spelling of 12000121988 in words is "twelve billion, one hundred twenty-one thousand, nine hundred eighty-eight".