21012210982 has 8 divisors (see below), whose sum is σ = 36020933136. Its totient is φ = 9005233272.

The previous prime is 21012210977. The next prime is 21012210997. The reversal of 21012210982 is 28901221012.

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 21012210982.

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, 750436093 + ... + 750436120.

It is an arithmetic number, because the mean of its divisors is an integer number (4502616642).

Almost surely, 2^21012210982 is an apocalyptic number.

21012210982 is a deficient number, since it is larger than the sum of its proper divisors (15008722154).

21012210982 is a wasteful number, since it uses less digits than its factorization.

21012210982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1500872222.

The product of its (nonzero) digits is 1152, while the sum is 28.

Adding to 21012210982 its reverse (28901221012), we get a palindrome (49913431994).

The spelling of 21012210982 in words is "twenty-one billion, twelve million, two hundred ten thousand, nine hundred eighty-two".