21210821182 has 8 divisors (see below), whose sum is σ = 32592237552. Its totient is φ = 10346742000.

The previous prime is 21210821179. The next prime is 21210821201. The reversal of 21210821182 is 28112801212.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21210821182.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129334194 + ... + 129334357.

It is an arithmetic number, because the mean of its divisors is an integer number (4074029694).

Almost surely, 2^21210821182 is an apocalyptic number.

21210821182 is a deficient number, since it is larger than the sum of its proper divisors (11381416370).

21210821182 is a wasteful number, since it uses less digits than its factorization.

21210821182 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258668594.

The product of its (nonzero) digits is 1024, while the sum is 28.

The spelling of 21210821182 in words is "twenty-one billion, two hundred ten million, eight hundred twenty-one thousand, one hundred eighty-two".