12021999943 has 2 divisors, whose sum is σ = 12021999944. Its totient is φ = 12021999942.

The previous prime is 12021999937. The next prime is 12022000021. The reversal of 12021999943 is 34999912021.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12021999943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12021999923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6010999971 + 6010999972.

It is an arithmetic number, because the mean of its divisors is an integer number (6010999972).

Almost surely, 2^12021999943 is an apocalyptic number.

12021999943 is a deficient number, since it is larger than the sum of its proper divisors (1).

12021999943 is an equidigital number, since it uses as much as digits as its factorization.

12021999943 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 314928, while the sum is 49.

The spelling of 12021999943 in words is "twelve billion, twenty-one million, nine hundred ninety-nine thousand, nine hundred forty-three".