121839993211 has 4 divisors (see below), whose sum is σ = 121843837792. Its totient is φ = 121836148632.

The previous prime is 121839993203. The next prime is 121839993251. The reversal of 121839993211 is 112399938121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 112399938121 = 335261².

It is a cyclic number.

It is not a de Polignac number, because 121839993211 - 2³ = 121839993203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121839993251) 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, 1874355 + ... + 1938268.

It is an arithmetic number, because the mean of its divisors is an integer number (30460959448).

Almost surely, 2^121839993211 is an apocalyptic number.

121839993211 is a deficient number, since it is larger than the sum of its proper divisors (3844581).

121839993211 is an equidigital number, since it uses as much as digits as its factorization.

121839993211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3844580.

The product of its digits is 209952, while the sum is 49.

The spelling of 121839993211 in words is "one hundred twenty-one billion, eight hundred thirty-nine million, nine hundred ninety-three thousand, two hundred eleven".