121321523 has 16 divisors (see below), whose sum is σ = 128079360. Its totient is φ = 114809376.

The previous prime is 121321493. The next prime is 121321531. The reversal of 121321523 is 325123121.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121321523 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121321495 and 121321504.

It is not an unprimeable number, because it can be changed into a prime (121321423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 185465 + ... + 186117.

It is an arithmetic number, because the mean of its divisors is an integer number (8004960).

Almost surely, 2^121321523 is an apocalyptic number.

121321523 is a deficient number, since it is larger than the sum of its proper divisors (6757837).

121321523 is an equidigital number, since it uses as much as digits as its factorization.

121321523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 826.

The product of its digits is 360, while the sum is 20.

The square root of 121321523 is about 11014.6049861082. The cubic root of 121321523 is about 495.0464507646.

Adding to 121321523 its reverse (325123121), we get a palindrome (446444644).

The spelling of 121321523 in words is "one hundred twenty-one million, three hundred twenty-one thousand, five hundred twenty-three".