83389021 has 4 divisors (see below), whose sum is σ = 84393792. Its totient is φ = 82384252.

The previous prime is 83389001. The next prime is 83389051. The reversal of 83389021 is 12098338.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 83389021 - 2⁵ = 83388989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83389001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 502261 + ... + 502426.

It is an arithmetic number, because the mean of its divisors is an integer number (21098448).

Almost surely, 2^83389021 is an apocalyptic number.

It is an amenable number.

83389021 is a deficient number, since it is larger than the sum of its proper divisors (1004771).

83389021 is a wasteful number, since it uses less digits than its factorization.

83389021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1004770.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 83389021 is about 9131.7589214784. The cubic root of 83389021 is about 436.8875060190.

The spelling of 83389021 in words is "eighty-three million, three hundred eighty-nine thousand, twenty-one".