21104005040 has 20 divisors (see below), whose sum is σ = 49066811904. Its totient is φ = 8441601984.

The previous prime is 21104005031. The next prime is 21104005081. The reversal of 21104005040 is 4050040112.

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 131899952 + ... + 131900111.

Almost surely, 2^21104005040 is an apocalyptic number.

21104005040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21104005040 is an abundant number, since it is smaller than the sum of its proper divisors (27962806864).

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

21104005040 is a wasteful number, since it uses less digits than its factorization.

21104005040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263800076 (or 263800070 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

Adding to 21104005040 its reverse (4050040112), we get a palindrome (25154045152).

The spelling of 21104005040 in words is "twenty-one billion, one hundred four million, five thousand, forty".