12021009998 has 8 divisors (see below), whose sum is σ = 18041127192. Its totient is φ = 6007300936.

The previous prime is 12021009997. The next prime is 12021010009. The reversal of 12021009998 is 89990012021.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021009991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1597340 + ... + 1604847.

It is an arithmetic number, because the mean of its divisors is an integer number (2255140899).

Almost surely, 2^12021009998 is an apocalyptic number.

12021009998 is a deficient number, since it is larger than the sum of its proper divisors (6020117194).

12021009998 is a wasteful number, since it uses less digits than its factorization.

12021009998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3204066.

The product of its (nonzero) digits is 23328, while the sum is 41.

The spelling of 12021009998 in words is "twelve billion, twenty-one million, nine thousand, nine hundred ninety-eight".