82018821 has 16 divisors (see below), whose sum is σ = 110617088. Its totient is φ = 54054000.

The previous prime is 82018813. The next prime is 82018823. The reversal of 82018821 is 12881028.

It is not a de Polignac number, because 82018821 - 2³ = 82018813 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 (82018823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 149670 + ... + 150216.

It is an arithmetic number, because the mean of its divisors is an integer number (6913568).

Almost surely, 2^82018821 is an apocalyptic number.

It is an amenable number.

82018821 is a deficient number, since it is larger than the sum of its proper divisors (28598267).

82018821 is a wasteful number, since it uses less digits than its factorization.

82018821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1032.

The product of its (nonzero) digits is 2048, while the sum is 30.

The square root of 82018821 is about 9056.4242943890. The cubic root of 82018821 is about 434.4813848496.

Adding to 82018821 its reverse (12881028), we get a palindrome (94899849).

The spelling of 82018821 in words is "eighty-two million, eighteen thousand, eight hundred twenty-one".