73821021 has 8 divisors (see below), whose sum is σ = 104217984. Its totient is φ = 46319040.

The previous prime is 73821019. The next prime is 73821029. The reversal of 73821021 is 12012837.

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

It is not a de Polignac number, because 73821021 - 2¹ = 73821019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 73820982 and 73821000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73821029) 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, 723685 + ... + 723786.

It is an arithmetic number, because the mean of its divisors is an integer number (13027248).

Almost surely, 2^73821021 is an apocalyptic number.

It is an amenable number.

73821021 is a deficient number, since it is larger than the sum of its proper divisors (30396963).

73821021 is a wasteful number, since it uses less digits than its factorization.

73821021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1447491.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 73821021 is about 8591.9160261260. The cubic root of 73821021 is about 419.4948973294.

Adding to 73821021 its reverse (12012837), we get a palindrome (85833858).

The spelling of 73821021 in words is "seventy-three million, eight hundred twenty-one thousand, twenty-one".