73820021 has 8 divisors (see below), whose sum is σ = 83129088. Its totient is φ = 64944000.

The previous prime is 73820017. The next prime is 73820027. The reversal of 73820021 is 12002837.

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

It is not a de Polignac number, because 73820021 - 2² = 73820017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73820027) 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, 107900 + ... + 108581.

It is an arithmetic number, because the mean of its divisors is an integer number (10391136).

Almost surely, 2^73820021 is an apocalyptic number.

It is an amenable number.

73820021 is a deficient number, since it is larger than the sum of its proper divisors (9309067).

73820021 is a wasteful number, since it uses less digits than its factorization.

73820021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216523.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 73820021 is about 8591.8578316916. The cubic root of 73820021 is about 419.4930031228.

Adding to 73820021 its reverse (12002837), we get a palindrome (85822858).

The spelling of 73820021 in words is "seventy-three million, eight hundred twenty thousand, twenty-one".