83916021 has 12 divisors (see below), whose sum is σ = 127936032. Its totient is φ = 47928024.

The previous prime is 83916017. The next prime is 83916061. The reversal of 83916021 is 12061938.

It is not a de Polignac number, because 83916021 - 2² = 83916017 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 83916021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83916011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40980 + ... + 42978.

It is an arithmetic number, because the mean of its divisors is an integer number (10661336).

Almost surely, 2^83916021 is an apocalyptic number.

It is an amenable number.

83916021 is a deficient number, since it is larger than the sum of its proper divisors (44020011).

83916021 is an frugal number, since it uses more digits than its factorization.

83916021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4008 (or 2009 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 83916021 is about 9160.5688142167. The cubic root of 83916021 is about 437.8059178494.

Adding to 83916021 its reverse (12061938), we get a palindrome (95977959).

The spelling of 83916021 in words is "eighty-three million, nine hundred sixteen thousand, twenty-one".