21104750920 has 32 divisors (see below), whose sum is σ = 51802571520. Its totient is φ = 7674454720.

The previous prime is 21104750911. The next prime is 21104750959. The reversal of 21104750920 is 2905740112.

It is a super-2 number, since 2×21104750920² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23982232 + ... + 23983111.

It is an arithmetic number, because the mean of its divisors is an integer number (1618830360).

Almost surely, 2^21104750920 is an apocalyptic number.

21104750920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21104750920 is an abundant number, since it is smaller than the sum of its proper divisors (30697820600).

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

21104750920 is a wasteful number, since it uses less digits than its factorization.

21104750920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47965365 (or 47965361 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 31.

The spelling of 21104750920 in words is "twenty-one billion, one hundred four million, seven hundred fifty thousand, nine hundred twenty".