83321821 has 8 divisors (see below), whose sum is σ = 95680800. Its totient is φ = 71760240.

The previous prime is 83321813. The next prime is 83321827. The reversal of 83321821 is 12812338.

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 83321821 - 2³ = 83321813 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 83321821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83321827) 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, 199126 + ... + 199543.

It is an arithmetic number, because the mean of its divisors is an integer number (11960100).

Almost surely, 2^83321821 is an apocalyptic number.

It is an amenable number.

83321821 is a deficient number, since it is larger than the sum of its proper divisors (12358979).

83321821 is a wasteful number, since it uses less digits than its factorization.

83321821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398699.

The product of its digits is 2304, while the sum is 28.

The square root of 83321821 is about 9128.0787135081. The cubic root of 83321821 is about 436.7701175428.

It can be divided in two parts, 8332 and 1821, that added together give a triangular number (10153 = T₁₄₂).

The spelling of 83321821 in words is "eighty-three million, three hundred twenty-one thousand, eight hundred twenty-one".