73012221 has 6 divisors (see below), whose sum is σ = 105462110. Its totient is φ = 48674808.

The previous prime is 73012157. The next prime is 73012241. The reversal of 73012221 is 12221037.

It can be written as a sum of positive squares in only one way, i.e., 69056100 + 3956121 = 8310^2 + 1989^2 .

It is not a de Polignac number, because 73012221 - 2⁶ = 73012157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 73012194 and 73012203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73012241) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4056226 + ... + 4056243.

Almost surely, 2^73012221 is an apocalyptic number.

It is an amenable number.

73012221 is a deficient number, since it is larger than the sum of its proper divisors (32449889).

73012221 is a wasteful number, since it uses less digits than its factorization.

73012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8112475 (or 8112472 counting only the distinct ones).

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

The square root of 73012221 is about 8544.7188953177. The cubic root of 73012221 is about 417.9572405762.

Adding to 73012221 its reverse (12221037), we get a palindrome (85233258).

The spelling of 73012221 in words is "seventy-three million, twelve thousand, two hundred twenty-one".