121530223 has 4 divisors (see below), whose sum is σ = 121560768. Its totient is φ = 121499680.

The previous prime is 121530209. The next prime is 121530293. The reversal of 121530223 is 322035121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 322035121 = 23 ⋅14001527.

It is a cyclic number.

It is not a de Polignac number, because 121530223 - 2²¹ = 119433071 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121530223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121530293) 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, 8218 + ... + 17623.

It is an arithmetic number, because the mean of its divisors is an integer number (30390192).

Almost surely, 2^121530223 is an apocalyptic number.

121530223 is a deficient number, since it is larger than the sum of its proper divisors (30545).

121530223 is an equidigital number, since it uses as much as digits as its factorization.

121530223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30544.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 121530223 is about 11024.0747004000. The cubic root of 121530223 is about 495.3301514798.

Adding to 121530223 its reverse (322035121), we get a palindrome (443565344).

The spelling of 121530223 in words is "one hundred twenty-one million, five hundred thirty thousand, two hundred twenty-three".