12021999971 has 4 divisors (see below), whose sum is σ = 12023095392. Its totient is φ = 12020904552.

The previous prime is 12021999943. The next prime is 12022000021. The reversal of 12021999971 is 17999912021.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12021999971 - 2⁶ = 12021999907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12021999901) 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, 531080 + ... + 553253.

It is an arithmetic number, because the mean of its divisors is an integer number (3005773848).

Almost surely, 2^12021999971 is an apocalyptic number.

12021999971 is a deficient number, since it is larger than the sum of its proper divisors (1095421).

12021999971 is a wasteful number, since it uses less digits than its factorization.

12021999971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1095420.

The product of its (nonzero) digits is 183708, while the sum is 50.

The spelling of 12021999971 in words is "twelve billion, twenty-one million, nine hundred ninety-nine thousand, nine hundred seventy-one".