73163021 has 4 divisors (see below), whose sum is σ = 73466844. Its totient is φ = 72859200.

The previous prime is 73163011. The next prime is 73163033. The reversal of 73163021 is 12036137.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12036137 = 37 ⋅325301.

It can be written as a sum of positive squares in 2 ways, for example, as 40513225 + 32649796 = 6365^2 + 5714^2 .

It is a cyclic number.

It is not a de Polignac number, because 73163021 - 2²² = 68968717 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 (73163011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151550 + ... + 152031.

It is an arithmetic number, because the mean of its divisors is an integer number (18366711).

Almost surely, 2^73163021 is an apocalyptic number.

It is an amenable number.

73163021 is a deficient number, since it is larger than the sum of its proper divisors (303823).

73163021 is a wasteful number, since it uses less digits than its factorization.

73163021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303822.

The product of its (nonzero) digits is 756, while the sum is 23.

The square root of 73163021 is about 8553.5385075418. The cubic root of 73163021 is about 418.2447933901.

Adding to 73163021 its reverse (12036137), we get a palindrome (85199158).

The spelling of 73163021 in words is "seventy-three million, one hundred sixty-three thousand, twenty-one".