73125021 has 8 divisors (see below), whose sum is σ = 97995744. Its totient is φ = 48502160.

The previous prime is 73125011. The next prime is 73125023. The reversal of 73125021 is 12052137.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 73125021 - 2⁷ = 73124893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73125023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61275 + ... + 62456.

It is an arithmetic number, because the mean of its divisors is an integer number (12249468).

Almost surely, 2^73125021 is an apocalyptic number.

It is an amenable number.

73125021 is a deficient number, since it is larger than the sum of its proper divisors (24870723).

73125021 is a wasteful number, since it uses less digits than its factorization.

73125021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123931.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 73125021 is about 8551.3169161247. The cubic root of 73125021 is about 418.1723703986.

Adding to 73125021 its reverse (12052137), we get a palindrome (85177158).

It can be divided in two parts, 731 and 25021, that added together give a palindrome (25752).

The spelling of 73125021 in words is "seventy-three million, one hundred twenty-five thousand, twenty-one".