121540223 has 8 divisors (see below), whose sum is σ = 139223040. Its totient is φ = 103937400.

The previous prime is 121540219. The next prime is 121540229. The reversal of 121540223 is 322045121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121540223 - 2² = 121540219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121540195 and 121540204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121540229) 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 7 ways as a sum of consecutive naturals, for example, 16703 + ... + 22848.

It is an arithmetic number, because the mean of its divisors is an integer number (17402880).

Almost surely, 2^121540223 is an apocalyptic number.

121540223 is a deficient number, since it is larger than the sum of its proper divisors (17682817).

121540223 is an equidigital number, since it uses as much as digits as its factorization.

121540223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39997.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 121540223 is about 11024.5282438751. The cubic root of 121540223 is about 495.3437370323.

Adding to 121540223 its reverse (322045121), we get a palindrome (443585344).

The spelling of 121540223 in words is "one hundred twenty-one million, five hundred forty thousand, two hundred twenty-three".