21111110982 has 48 divisors (see below), whose sum is σ = 49585562208. Its totient is φ = 6452697600.

The previous prime is 21111110981. The next prime is 21111111023. The reversal of 21111110982 is 28901111112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111110981) 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 23 ways as a sum of consecutive naturals, for example, 263403 + ... + 334070.

It is an arithmetic number, because the mean of its divisors is an integer number (1033032546).

Almost surely, 2^21111110982 is an apocalyptic number.

21111110982 is an abundant number, since it is smaller than the sum of its proper divisors (28474451226).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21111110982 is a wasteful number, since it uses less digits than its factorization.

21111110982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 597645 (or 597642 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 27.

The spelling of 21111110982 in words is "twenty-one billion, one hundred eleven million, one hundred ten thousand, nine hundred eighty-two".