82124021 has 4 divisors (see below), whose sum is σ = 93856032. Its totient is φ = 70392012.

The previous prime is 82124011. The next prime is 82124039. The reversal of 82124021 is 12042128.

It is a happy number.

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 82124021 - 2¹⁸ = 81861877 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 82123984 and 82124002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82124011) 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, 5865995 + ... + 5866008.

It is an arithmetic number, because the mean of its divisors is an integer number (23464008).

Almost surely, 2^82124021 is an apocalyptic number.

It is an amenable number.

82124021 is a deficient number, since it is larger than the sum of its proper divisors (11732011).

82124021 is a wasteful number, since it uses less digits than its factorization.

82124021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11732010.

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 82124021 is about 9062.2304649573. The cubic root of 82124021 is about 434.6670654576.

Adding to 82124021 its reverse (12042128), we get a palindrome (94166149).

It can be divided in two parts, 821 and 24021, that added together give a palindrome (24842).

The spelling of 82124021 in words is "eighty-two million, one hundred twenty-four thousand, twenty-one".