730005021 has 16 divisors (see below), whose sum is σ = 1081960320. Its totient is φ = 486457920.

The previous prime is 730005011. The next prime is 730005047. The reversal of 730005021 is 120500037.

It is not a de Polignac number, because 730005021 - 2²⁷ = 595787293 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 730004985 and 730005003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (730005011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79936 + ... + 88598.

It is an arithmetic number, because the mean of its divisors is an integer number (67622520).

Almost surely, 2^730005021 is an apocalyptic number.

It is an amenable number.

730005021 is a deficient number, since it is larger than the sum of its proper divisors (351955299).

730005021 is a wasteful number, since it uses less digits than its factorization.

730005021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11793 (or 11787 counting only the distinct ones).

The product of its (nonzero) digits is 210, while the sum is 18.

The square root of 730005021 is about 27018.6050898265. The cubic root of 730005021 is about 900.4133989724.

Adding to 730005021 its reverse (120500037), we get a palindrome (850505058).

The spelling of 730005021 in words is "seven hundred thirty million, five thousand, twenty-one".