73117421 has 4 divisors (see below), whose sum is σ = 78741852. Its totient is φ = 67492992.

The previous prime is 73117417. The next prime is 73117469. The reversal of 73117421 is 12471137.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 43414921 + 29702500 = 6589^2 + 5450^2 .

It is a cyclic number.

It is not a de Polignac number, because 73117421 - 2² = 73117417 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73117481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2812196 + ... + 2812221.

It is an arithmetic number, because the mean of its divisors is an integer number (19685463).

Almost surely, 2^73117421 is an apocalyptic number.

It is an amenable number.

73117421 is a deficient number, since it is larger than the sum of its proper divisors (5624431).

73117421 is a wasteful number, since it uses less digits than its factorization.

73117421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5624430.

The product of its digits is 1176, while the sum is 26.

The square root of 73117421 is about 8550.8725285786. The cubic root of 73117421 is about 418.1578827897.

Adding to 73117421 its reverse (12471137), we get a palindrome (85588558).

The spelling of 73117421 in words is "seventy-three million, one hundred seventeen thousand, four hundred twenty-one".