12121011800999 has 2 divisors, whose sum is σ = 12121011801000. Its totient is φ = 12121011800998.

The previous prime is 12121011800977. The next prime is 12121011801071. The reversal of 12121011800999 is 99900811012121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12121011800999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12121011800099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6060505900499 + 6060505900500.

It is an arithmetic number, because the mean of its divisors is an integer number (6060505900500).

Almost surely, 2^{12121011800999} is an apocalyptic number.

12121011800999 is a deficient number, since it is larger than the sum of its proper divisors (1).

12121011800999 is an equidigital number, since it uses as much as digits as its factorization.

12121011800999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 44.

The spelling of 12121011800999 in words is "twelve trillion, one hundred twenty-one billion, eleven million, eight hundred thousand, nine hundred ninety-nine".