82266821 has 32 divisors (see below), whose sum is σ = 104552448. Its totient is φ = 63011520.

The previous prime is 82266817. The next prime is 82266911. The reversal of 82266821 is 12866228.

It is not a de Polignac number, because 82266821 - 2² = 82266817 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82266221) 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, 627926 + ... + 628056.

It is an arithmetic number, because the mean of its divisors is an integer number (3267264).

Almost surely, 2^82266821 is an apocalyptic number.

It is an amenable number.

82266821 is a deficient number, since it is larger than the sum of its proper divisors (22285627).

82266821 is a wasteful number, since it uses less digits than its factorization.

82266821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321.

The product of its digits is 18432, while the sum is 35.

The square root of 82266821 is about 9070.1058979485. The cubic root of 82266821 is about 434.9188574594.

The spelling of 82266821 in words is "eighty-two million, two hundred sixty-six thousand, eight hundred twenty-one".