73210221 has 12 divisors (see below), whose sum is σ = 120855072. Its totient is φ = 41834376.

The previous prime is 73210213. The next prime is 73210253. The reversal of 73210221 is 12201237.

It is not a de Polignac number, because 73210221 - 2³ = 73210213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 73210194 and 73210203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73210201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 580971 + ... + 581096.

It is an arithmetic number, because the mean of its divisors is an integer number (10071256).

Almost surely, 2^73210221 is an apocalyptic number.

It is an amenable number.

73210221 is a deficient number, since it is larger than the sum of its proper divisors (47644851).

73210221 is a wasteful number, since it uses less digits than its factorization.

73210221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1162080 (or 1162077 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 73210221 is about 8556.2971547276. The cubic root of 73210221 is about 418.3347154585.

Adding to 73210221 its reverse (12201237), we get a palindrome (85411458).

The spelling of 73210221 in words is "seventy-three million, two hundred ten thousand, two hundred twenty-one".