82425021 has 32 divisors (see below), whose sum is σ = 133109760. Its totient is φ = 44318016.

The previous prime is 82425019. The next prime is 82425041. The reversal of 82425021 is 12052428.

It is not a de Polignac number, because 82425021 - 2¹ = 82425019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 82424982 and 82425000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82425041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 66015 + ... + 67251.

It is an arithmetic number, because the mean of its divisors is an integer number (4159680).

Almost surely, 2^82425021 is an apocalyptic number.

It is an amenable number.

82425021 is a deficient number, since it is larger than the sum of its proper divisors (50684739).

82425021 is a wasteful number, since it uses less digits than its factorization.

82425021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1433.

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 82425021 is about 9078.8226659628. The cubic root of 82425021 is about 435.1974635274.

Adding to 82425021 its reverse (12052428), we get a palindrome (94477449).

The spelling of 82425021 in words is "eighty-two million, four hundred twenty-five thousand, twenty-one".