82226821 has 2 divisors, whose sum is σ = 82226822. Its totient is φ = 82226820.

The previous prime is 82226819. The next prime is 82226831. The reversal of 82226821 is 12862228.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45077796 + 37149025 = 6714^2 + 6095^2 .

It is a cyclic number.

It is not a de Polignac number, because 82226821 - 2¹ = 82226819 is a prime.

It is a super-2 number, since 2×82226821² = 13522500183532082, which contains 22 as substring.

Together with 82226819, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82226831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41113410 + 41113411.

It is an arithmetic number, because the mean of its divisors is an integer number (41113411).

Almost surely, 2^82226821 is an apocalyptic number.

It is an amenable number.

82226821 is a deficient number, since it is larger than the sum of its proper divisors (1).

82226821 is an equidigital number, since it uses as much as digits as its factorization.

82226821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6144, while the sum is 31.

The square root of 82226821 is about 9067.9005839279. The cubic root of 82226821 is about 434.8483568841.

The spelling of 82226821 in words is "eighty-two million, two hundred twenty-six thousand, eight hundred twenty-one".