12021985109 has 8 divisors (see below), whose sum is σ = 12316778880. Its totient is φ = 11727266400.

The previous prime is 12021985097. The next prime is 12021985123. The reversal of 12021985109 is 90158912021.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 12021985109 - 2⁴ = 12021985093 is a prime.

It is a super-2 number, since 2×12021985109² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021985139) 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, 442694 + ... + 469064.

It is an arithmetic number, because the mean of its divisors is an integer number (1539597360).

Almost surely, 2^12021985109 is an apocalyptic number.

It is an amenable number.

12021985109 is a deficient number, since it is larger than the sum of its proper divisors (294793771).

12021985109 is a wasteful number, since it uses less digits than its factorization.

12021985109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37531.

The product of its (nonzero) digits is 12960, while the sum is 38.

The spelling of 12021985109 in words is "twelve billion, twenty-one million, nine hundred eighty-five thousand, one hundred nine".