73536021 has 24 divisors (see below), whose sum is σ = 114852920. Its totient is φ = 45069696.

The previous prime is 73536019. The next prime is 73536041. The reversal of 73536021 is 12063537.

It is a happy number.

73536021 is a `hidden beast` number, since 7 + 3 + 53 + 602 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 5225796 + 68310225 = 2286^2 + 8265^2 .

It is not a de Polignac number, because 73536021 - 2¹ = 73536019 is a prime.

It is a super-3 number, since 3×73536021³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73536011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31275 + ... + 33543.

Almost surely, 2^73536021 is an apocalyptic number.

It is an amenable number.

73536021 is a deficient number, since it is larger than the sum of its proper divisors (41316899).

73536021 is a wasteful number, since it uses less digits than its factorization.

73536021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2565 (or 2562 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 27.

The square root of 73536021 is about 8575.3146297964. The cubic root of 73536021 is about 418.9543546709.

Adding to 73536021 its reverse (12063537), we get a palindrome (85599558).

The spelling of 73536021 in words is "seventy-three million, five hundred thirty-six thousand, twenty-one".