82812821 has 8 divisors (see below), whose sum is σ = 101923584. Its totient is φ = 65522160.

The previous prime is 82812817. The next prime is 82812833. The reversal of 82812821 is 12821828.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 82812821 - 2² = 82812817 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82812881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 454925 + ... + 455106.

It is an arithmetic number, because the mean of its divisors is an integer number (12740448).

Almost surely, 2^82812821 is an apocalyptic number.

It is an amenable number.

82812821 is a deficient number, since it is larger than the sum of its proper divisors (19110763).

82812821 is a wasteful number, since it uses less digits than its factorization.

82812821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910051.

The product of its digits is 4096, while the sum is 32.

The square root of 82812821 is about 9100.1549986800. The cubic root of 82812821 is about 435.8789135033.

The spelling of 82812821 in words is "eighty-two million, eight hundred twelve thousand, eight hundred twenty-one".