73405221 has 4 divisors (see below), whose sum is σ = 97873632. Its totient is φ = 48936812.

The previous prime is 73405219. The next prime is 73405243. The reversal of 73405221 is 12250437.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12250437 = 3 ⋅4083479.

It is a cyclic number.

It is not a de Polignac number, because 73405221 - 2¹ = 73405219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 73405191 and 73405200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73405271) 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, 12234201 + ... + 12234206.

It is an arithmetic number, because the mean of its divisors is an integer number (24468408).

Almost surely, 2^73405221 is an apocalyptic number.

It is an amenable number.

73405221 is a deficient number, since it is larger than the sum of its proper divisors (24468411).

73405221 is a wasteful number, since it uses less digits than its factorization.

73405221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24468410.

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 73405221 is about 8567.6846930778. The cubic root of 73405221 is about 418.7058064002.

Adding to 73405221 its reverse (12250437), we get a palindrome (85655658).

It can be divided in two parts, 7340 and 5221, that added together give a triangular number (12561 = T₁₅₈).

The spelling of 73405221 in words is "seventy-three million, four hundred five thousand, two hundred twenty-one".