83217921 has 8 divisors (see below), whose sum is σ = 113956224. Its totient is φ = 53979120.

The previous prime is 83217877. The next prime is 83217931. The reversal of 83217921 is 12971238.

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

It is not a de Polignac number, because 83217921 - 2⁷ = 83217793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (83217931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 374745 + ... + 374966.

It is an arithmetic number, because the mean of its divisors is an integer number (14244528).

Almost surely, 2^83217921 is an apocalyptic number.

It is an amenable number.

83217921 is a deficient number, since it is larger than the sum of its proper divisors (30738303).

83217921 is a wasteful number, since it uses less digits than its factorization.

83217921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 749751.

The product of its digits is 6048, while the sum is 33.

The square root of 83217921 is about 9122.3857076973. The cubic root of 83217921 is about 436.5884952881.

The spelling of 83217921 in words is "eighty-three million, two hundred seventeen thousand, nine hundred twenty-one".