82312421 has 4 divisors (see below), whose sum is σ = 82330752. Its totient is φ = 82294092.

The previous prime is 82312397. The next prime is 82312441. The reversal of 82312421 is 12421328.

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 82312421 - 2²⁶ = 15203557 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 (82312441) 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, 2636 + ... + 13098.

It is an arithmetic number, because the mean of its divisors is an integer number (20582688).

Almost surely, 2^82312421 is an apocalyptic number.

It is an amenable number.

82312421 is a deficient number, since it is larger than the sum of its proper divisors (18331).

82312421 is a wasteful number, since it uses less digits than its factorization.

82312421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18330.

The product of its digits is 768, while the sum is 23.

The square root of 82312421 is about 9072.6193020538. The cubic root of 82312421 is about 434.9992002451. Note that the first 3 decimals are identical.

Adding to 82312421 its reverse (12421328), we get a palindrome (94733749).

The spelling of 82312421 in words is "eighty-two million, three hundred twelve thousand, four hundred twenty-one".