82121233 has 4 divisors (see below), whose sum is σ = 82146160. Its totient is φ = 82096308.

The previous prime is 82121219. The next prime is 82121239. The reversal of 82121233 is 33212128.

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 a de Polignac number, because none of the positive numbers 2^k-82121233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82121239) 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, 6603 + ... + 14416.

It is an arithmetic number, because the mean of its divisors is an integer number (20536540).

Almost surely, 2^82121233 is an apocalyptic number.

It is an amenable number.

82121233 is a deficient number, since it is larger than the sum of its proper divisors (24927).

82121233 is a wasteful number, since it uses less digits than its factorization.

82121233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24926.

The product of its digits is 576, while the sum is 22.

The square root of 82121233 is about 9062.0766383870. The cubic root of 82121233 is about 434.6621466146.

The spelling of 82121233 in words is "eighty-two million, one hundred twenty-one thousand, two hundred thirty-three".