21101220982 has 16 divisors (see below), whose sum is σ = 33321187440. Its totient is φ = 9994274208.

The previous prime is 21101220971. The next prime is 21101220983. The reversal of 21101220982 is 28902210112.

It is a self number, because there is not a number n which added to its sum of digits gives 21101220982.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101220983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 439128 + ... + 484804.

It is an arithmetic number, because the mean of its divisors is an integer number (2082574215).

Almost surely, 2^21101220982 is an apocalyptic number.

21101220982 is a deficient number, since it is larger than the sum of its proper divisors (12219966458).

21101220982 is a wasteful number, since it uses less digits than its factorization.

21101220982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57855.

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

The spelling of 21101220982 in words is "twenty-one billion, one hundred one million, two hundred twenty thousand, nine hundred eighty-two".