113121321 has 16 divisors (see below), whose sum is σ = 155397504. Its totient is φ = 73142784.

The previous prime is 113121317. The next prime is 113121341. The reversal of 113121321 is 123121311.

It is a happy number.

It is not a de Polignac number, because 113121321 - 2² = 113121317 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 113121321.

It is not an unprimeable number, because it can be changed into a prime (113121301) 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 15 ways as a sum of consecutive naturals, for example, 37740 + ... + 40626.

It is an arithmetic number, because the mean of its divisors is an integer number (9712344).

Almost surely, 2^113121321 is an apocalyptic number.

It is an amenable number.

113121321 is a deficient number, since it is larger than the sum of its proper divisors (42276183).

113121321 is a wasteful number, since it uses less digits than its factorization.

113121321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3280.

The product of its digits is 36, while the sum is 15.

The square root of 113121321 is about 10635.8507417131. The cubic root of 113121321 is about 483.6317706114.

Adding to 113121321 its reverse (123121311), we get a palindrome (236242632).

The spelling of 113121321 in words is "one hundred thirteen million, one hundred twenty-one thousand, three hundred twenty-one".