121520233 has 8 divisors (see below), whose sum is σ = 129610152. Its totient is φ = 113534976.

The previous prime is 121520227. The next prime is 121520251. The reversal of 121520233 is 332025121.

It can be written as a sum of positive squares in 4 ways, for example, as 5139289 + 116380944 = 2267^2 + 10788^2 .

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

It is not a de Polignac number, because 121520233 - 2¹⁷ = 121389161 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 121520233.

It is not an unprimeable number, because it can be changed into a prime (121520033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23760 + ... + 28417.

It is an arithmetic number, because the mean of its divisors is an integer number (16201269).

Almost surely, 2^121520233 is an apocalyptic number.

It is an amenable number.

121520233 is a deficient number, since it is larger than the sum of its proper divisors (8089919).

121520233 is a wasteful number, since it uses less digits than its factorization.

121520233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52331.

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

The square root of 121520233 is about 11023.6215918363. The cubic root of 121520233 is about 495.3165787687.

Adding to 121520233 its reverse (332025121), we get a palindrome (453545354).

The spelling of 121520233 in words is "one hundred twenty-one million, five hundred twenty thousand, two hundred thirty-three".