82567221 has 16 divisors (see below), whose sum is σ = 122069568. Its totient is φ = 49219200.

The previous prime is 82567213. The next prime is 82567223. The reversal of 82567221 is 12276528.

It is not a de Polignac number, because 82567221 - 2³ = 82567213 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82567223) 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, 18496 + ... + 22521.

It is an arithmetic number, because the mean of its divisors is an integer number (7629348).

Almost surely, 2^82567221 is an apocalyptic number.

It is an amenable number.

82567221 is a deficient number, since it is larger than the sum of its proper divisors (39502347).

82567221 is a wasteful number, since it uses less digits than its factorization.

82567221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41092.

The product of its digits is 13440, while the sum is 33.

The square root of 82567221 is about 9086.6507030919. The cubic root of 82567221 is about 435.4475879213.

The spelling of 82567221 in words is "eighty-two million, five hundred sixty-seven thousand, two hundred twenty-one".