83408021 has 8 divisors (see below), whose sum is σ = 84370944. Its totient is φ = 82450800.

The previous prime is 83408009. The next prime is 83408029. The reversal of 83408021 is 12080438.

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 83408021 - 2¹⁸ = 83145877 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 (83408029) 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, 32435 + ... + 34911.

It is an arithmetic number, because the mean of its divisors is an integer number (10546368).

Almost surely, 2^83408021 is an apocalyptic number.

It is an amenable number.

83408021 is a deficient number, since it is larger than the sum of its proper divisors (962923).

83408021 is a wasteful number, since it uses less digits than its factorization.

83408021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2851.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 83408021 is about 9132.7991875438. The cubic root of 83408021 is about 436.9206847763.

Adding to 83408021 its reverse (12080438), we get a palindrome (95488459).

It can be divided in two parts, 8340 and 8021, that added together give a palindrome (16361).

The spelling of 83408021 in words is "eighty-three million, four hundred eight thousand, twenty-one".