1212120121999 has 8 divisors (see below), whose sum is σ = 1284232086720. Its totient is φ = 1140098244096.

The previous prime is 1212120121981. The next prime is 1212120122011. The reversal of 1212120121999 is 9991210212121.

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 1212120121999 - 2¹³ = 1212120113807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212120121909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22493994 + ... + 22547815.

It is an arithmetic number, because the mean of its divisors is an integer number (160529010840).

Almost surely, 2^{1212120121999} is an apocalyptic number.

1212120121999 is a deficient number, since it is larger than the sum of its proper divisors (72111964721).

1212120121999 is a wasteful number, since it uses less digits than its factorization.

1212120121999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45043409.

The product of its (nonzero) digits is 11664, while the sum is 40.

The spelling of 1212120121999 in words is "one trillion, two hundred twelve billion, one hundred twenty million, one hundred twenty-one thousand, nine hundred ninety-nine".