73127221 has 4 divisors (see below), whose sum is σ = 73243744. Its totient is φ = 73010700.

The previous prime is 73127209. The next prime is 73127237. The reversal of 73127221 is 12272137.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 73127221 - 2⁹ = 73126709 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 (73127261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57315 + ... + 58576.

It is an arithmetic number, because the mean of its divisors is an integer number (18310936).

Almost surely, 2^73127221 is an apocalyptic number.

It is an amenable number.

73127221 is a deficient number, since it is larger than the sum of its proper divisors (116523).

73127221 is a wasteful number, since it uses less digits than its factorization.

73127221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116522.

The product of its digits is 1176, while the sum is 25.

The square root of 73127221 is about 8551.4455503149. The cubic root of 73127221 is about 418.1765639928.

Adding to 73127221 its reverse (12272137), we get a palindrome (85399358).

The spelling of 73127221 in words is "seventy-three million, one hundred twenty-seven thousand, two hundred twenty-one".