121242120999 has 4 divisors (see below), whose sum is σ = 161656161336. Its totient is φ = 80828080664.

The previous prime is 121242120983. The next prime is 121242121001. The reversal of 121242120999 is 999021242121.

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 121242120999 - 2⁴ = 121242120983 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121242120999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121242190999) 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, 20207020164 + ... + 20207020169.

It is an arithmetic number, because the mean of its divisors is an integer number (40414040334).

Almost surely, 2^121242120999 is an apocalyptic number.

121242120999 is a deficient number, since it is larger than the sum of its proper divisors (40414040337).

121242120999 is an equidigital number, since it uses as much as digits as its factorization.

121242120999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40414040336.

The product of its (nonzero) digits is 46656, while the sum is 42.

The spelling of 121242120999 in words is "one hundred twenty-one billion, two hundred forty-two million, one hundred twenty thousand, nine hundred ninety-nine".