82021219 has 4 divisors (see below), whose sum is σ = 93738544. Its totient is φ = 70303896.

The previous prime is 82021211. The next prime is 82021223. The reversal of 82021219 is 91212028.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 82021219 - 2³ = 82021211 is a prime.

It is a super-2 number, since 2×82021219² = 13454960732491922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 82021193 and 82021202.

It is not an unprimeable number, because it can be changed into a prime (82021211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5858652 + ... + 5858665.

It is an arithmetic number, because the mean of its divisors is an integer number (23434636).

Almost surely, 2^82021219 is an apocalyptic number.

82021219 is a deficient number, since it is larger than the sum of its proper divisors (11717325).

82021219 is a wasteful number, since it uses less digits than its factorization.

82021219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11717324.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 82021219 is about 9056.5566856284. The cubic root of 82021219 is about 434.4856191469.

The spelling of 82021219 in words is "eighty-two million, twenty-one thousand, two hundred nineteen".