21001110984 has 48 divisors (see below), whose sum is σ = 65003440320. Its totient is φ = 6000317280.

The previous prime is 21001110967. The next prime is 21001111063. The reversal of 21001110984 is 48901110012.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20833932 + ... + 20834939.

It is an arithmetic number, because the mean of its divisors is an integer number (1354238340).

Almost surely, 2^21001110984 is an apocalyptic number.

21001110984 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21001110984 is an abundant number, since it is smaller than the sum of its proper divisors (44002329336).

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

21001110984 is a wasteful number, since it uses less digits than its factorization.

21001110984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41668890 (or 41668883 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 27.

Adding to 21001110984 its reverse (48901110012), we get a palindrome (69902220996).

The spelling of 21001110984 in words is "twenty-one billion, one million, one hundred ten thousand, nine hundred eighty-four".