82055221 has 2 divisors, whose sum is σ = 82055222. Its totient is φ = 82055220.

The previous prime is 82055219. The next prime is 82055257. The reversal of 82055221 is 12255028.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81270225 + 784996 = 9015^2 + 886^2 .

It is a cyclic number.

It is not a de Polignac number, because 82055221 - 2¹ = 82055219 is a prime.

Together with 82055219, 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 (82055261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41027610 + 41027611.

It is an arithmetic number, because the mean of its divisors is an integer number (41027611).

Almost surely, 2^82055221 is an apocalyptic number.

It is an amenable number.

82055221 is a deficient number, since it is larger than the sum of its proper divisors (1).

82055221 is an equidigital number, since it uses as much as digits as its factorization.

82055221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 82055221 is about 9058.4336946296. The cubic root of 82055221 is about 434.5456497066.

The spelling of 82055221 in words is "eighty-two million, fifty-five thousand, two hundred twenty-one".