73471021 has 4 divisors (see below), whose sum is σ = 79122652. Its totient is φ = 67819392.

The previous prime is 73471003. The next prime is 73471031. The reversal of 73471021 is 12017437.

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: 12017437 = 113 ⋅106349.

It can be written as a sum of positive squares in 2 ways, for example, as 48580900 + 24890121 = 6970^2 + 4989^2 .

It is a cyclic number.

It is not a de Polignac number, because 73471021 - 2¹⁷ = 73339949 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 (73471031) 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, 2825796 + ... + 2825821.

It is an arithmetic number, because the mean of its divisors is an integer number (19780663).

Almost surely, 2^73471021 is an apocalyptic number.

It is an amenable number.

73471021 is a deficient number, since it is larger than the sum of its proper divisors (5651631).

73471021 is a wasteful number, since it uses less digits than its factorization.

73471021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5651630.

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

The square root of 73471021 is about 8571.5238435181. The cubic root of 73471021 is about 418.8308774948.

Adding to 73471021 its reverse (12017437), we get a palindrome (85488458).

The spelling of 73471021 in words is "seventy-three million, four hundred seventy-one thousand, twenty-one".