121316538 has 16 divisors (see below), whose sum is σ = 277295040. Its totient is φ = 34661856.

The previous prime is 121316537. The next prime is 121316557. The reversal of 121316538 is 835613121.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (121316537) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1444203 + ... + 1444286.

It is an arithmetic number, because the mean of its divisors is an integer number (17330940).

Almost surely, 2^121316538 is an apocalyptic number.

121316538 is an abundant number, since it is smaller than the sum of its proper divisors (155978502).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121316538 is a wasteful number, since it uses less digits than its factorization.

121316538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2888501.

The product of its digits is 4320, while the sum is 30.

The square root of 121316538 is about 11014.3786933263. The cubic root of 121316538 is about 495.0396703234.

Adding to 121316538 its reverse (835613121), we get a palindrome (956929659).

The spelling of 121316538 in words is "one hundred twenty-one million, three hundred sixteen thousand, five hundred thirty-eight".