121752321 has 4 divisors (see below), whose sum is σ = 162336432. Its totient is φ = 81168212.

The previous prime is 121752299. The next prime is 121752343. The reversal of 121752321 is 123257121.

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 an interprime number because it is at equal distance from previous prime (121752299) and next prime (121752343).

It is a cyclic number.

It is not a de Polignac number, because 121752321 - 2¹⁵ = 121719553 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 121752291 and 121752300.

It is not an unprimeable number, because it can be changed into a prime (121752391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20292051 + ... + 20292056.

It is an arithmetic number, because the mean of its divisors is an integer number (40584108).

Almost surely, 2^121752321 is an apocalyptic number.

It is an amenable number.

121752321 is a deficient number, since it is larger than the sum of its proper divisors (40584111).

121752321 is an equidigital number, since it uses as much as digits as its factorization.

121752321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40584110.

The product of its digits is 840, while the sum is 24.

The square root of 121752321 is about 11034.1434194051. The cubic root of 121752321 is about 495.6317085335.

The spelling of 121752321 in words is "one hundred twenty-one million, seven hundred fifty-two thousand, three hundred twenty-one".