82621213 has 4 divisors (see below), whose sum is σ = 82858300. Its totient is φ = 82384128.

The previous prime is 82621199. The next prime is 82621229. The reversal of 82621213 is 31212628.

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

It can be written as a sum of positive squares in 2 ways, for example, as 48958009 + 33663204 = 6997^2 + 5802^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82621213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82621243) 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, 118020 + ... + 118717.

It is an arithmetic number, because the mean of its divisors is an integer number (20714575).

Almost surely, 2^82621213 is an apocalyptic number.

It is an amenable number.

82621213 is a deficient number, since it is larger than the sum of its proper divisors (237087).

82621213 is a wasteful number, since it uses less digits than its factorization.

82621213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237086.

The product of its digits is 1152, while the sum is 25.

The square root of 82621213 is about 9089.6211692237. The cubic root of 82621213 is about 435.5424825743.

The spelling of 82621213 in words is "eighty-two million, six hundred twenty-one thousand, two hundred thirteen".