12120021999 has 12 divisors (see below), whose sum is σ = 17508033816. Its totient is φ = 8079398352.

The previous prime is 12120021941. The next prime is 12120022001. The reversal of 12120021999 is 99912002121.

It is not a de Polignac number, because 12120021999 - 2⁸ = 12120021743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12120021499) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 95197 + ... + 182489.

It is an arithmetic number, because the mean of its divisors is an integer number (1459002818).

Almost surely, 2^12120021999 is an apocalyptic number.

12120021999 is a deficient number, since it is larger than the sum of its proper divisors (5388011817).

12120021999 is a wasteful number, since it uses less digits than its factorization.

12120021999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102726 (or 102723 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 36.

The spelling of 12120021999 in words is "twelve billion, one hundred twenty million, twenty-one thousand, nine hundred ninety-nine".