82121023 has 4 divisors (see below), whose sum is σ = 82551168. Its totient is φ = 81690880.

The previous prime is 82120993. The next prime is 82121041. The reversal of 82121023 is 32012128.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82121023 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 (82121623) 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, 214786 + ... + 215167.

It is an arithmetic number, because the mean of its divisors is an integer number (20637792).

Almost surely, 2^82121023 is an apocalyptic number.

82121023 is a deficient number, since it is larger than the sum of its proper divisors (430145).

82121023 is a wasteful number, since it uses less digits than its factorization.

82121023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430144.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 82121023 is about 9062.0650516314. The cubic root of 82121023 is about 434.6617761090.

The spelling of 82121023 in words is "eighty-two million, one hundred twenty-one thousand, twenty-three".