21120220982 has 48 divisors (see below), whose sum is σ = 38863074240. Its totient is φ = 8559471312.

The previous prime is 21120220969. The next prime is 21120220987. The reversal of 21120220982 is 28902202112.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120220987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1038233 + ... + 1058379.

It is an arithmetic number, because the mean of its divisors is an integer number (809647380).

Almost surely, 2^21120220982 is an apocalyptic number.

21120220982 is a deficient number, since it is larger than the sum of its proper divisors (17742853258).

21120220982 is a wasteful number, since it uses less digits than its factorization.

21120220982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20745 (or 20738 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 29.

The spelling of 21120220982 in words is "twenty-one billion, one hundred twenty million, two hundred twenty thousand, nine hundred eighty-two".