121621933 has 4 divisors (see below), whose sum is σ = 121689148. Its totient is φ = 121554720.

The previous prime is 121621889. The next prime is 121621937. The reversal of 121621933 is 339126121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 42536484 + 79085449 = 6522^2 + 8893^2 .

It is a cyclic number.

It is not a de Polignac number, because 121621933 - 2⁹ = 121621421 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 (121621937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30816 + ... + 34537.

It is an arithmetic number, because the mean of its divisors is an integer number (30422287).

Almost surely, 2^121621933 is an apocalyptic number.

It is an amenable number.

121621933 is a deficient number, since it is larger than the sum of its proper divisors (67215).

121621933 is an equidigital number, since it uses as much as digits as its factorization.

121621933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67214.

The product of its digits is 1944, while the sum is 28.

The square root of 121621933 is about 11028.2334487442. The cubic root of 121621933 is about 495.4547166706.

The spelling of 121621933 in words is "one hundred twenty-one million, six hundred twenty-one thousand, nine hundred thirty-three".