21220020982 has 8 divisors (see below), whose sum is σ = 31834101096. Its totient is φ = 10608653952.

The previous prime is 21220020973. The next prime is 21220020989. The reversal of 21220020982 is 28902002212.

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 21220020982.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220020989) 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, 658603 + ... + 690070.

It is an arithmetic number, because the mean of its divisors is an integer number (3979262637).

Almost surely, 2^21220020982 is an apocalyptic number.

21220020982 is a deficient number, since it is larger than the sum of its proper divisors (10614080114).

21220020982 is a wasteful number, since it uses less digits than its factorization.

21220020982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1356542.

The product of its (nonzero) digits is 2304, while the sum is 28.

The spelling of 21220020982 in words is "twenty-one billion, two hundred twenty million, twenty thousand, nine hundred eighty-two".