73217121 has 8 divisors (see below), whose sum is σ = 98858880. Its totient is φ = 48193392.

The previous prime is 73217099. The next prime is 73217129. The reversal of 73217121 is 12171237.

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

It is not a de Polignac number, because 73217121 - 2⁹ = 73216609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 73217091 and 73217100.

It is not an unprimeable number, because it can be changed into a prime (73217129) 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, 154230 + ... + 154703.

It is an arithmetic number, because the mean of its divisors is an integer number (12357360).

Almost surely, 2^73217121 is an apocalyptic number.

It is an amenable number.

73217121 is a deficient number, since it is larger than the sum of its proper divisors (25641759).

73217121 is a wasteful number, since it uses less digits than its factorization.

73217121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309015.

The product of its digits is 588, while the sum is 24.

The square root of 73217121 is about 8556.7003570302. The cubic root of 73217121 is about 418.3478576073.

Adding to 73217121 its reverse (12171237), we get a palindrome (85388358).

The spelling of 73217121 in words is "seventy-three million, two hundred seventeen thousand, one hundred twenty-one".