121815933 has 4 divisors (see below), whose sum is σ = 162421248. Its totient is φ = 81210620.

The previous prime is 121815899. The next prime is 121815949. The reversal of 121815933 is 339518121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121815933 - 2¹⁴ = 121799549 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121815894 and 121815903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121815233) 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, 20302653 + ... + 20302658.

It is an arithmetic number, because the mean of its divisors is an integer number (40605312).

Almost surely, 2^121815933 is an apocalyptic number.

It is an amenable number.

121815933 is a deficient number, since it is larger than the sum of its proper divisors (40605315).

121815933 is an equidigital number, since it uses as much as digits as its factorization.

121815933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40605314.

The product of its digits is 6480, while the sum is 33.

The square root of 121815933 is about 11037.0255503917. The cubic root of 121815933 is about 495.7180111593.

The spelling of 121815933 in words is "one hundred twenty-one million, eight hundred fifteen thousand, nine hundred thirty-three".