21008763104 has 24 divisors (see below), whose sum is σ = 47269717488. Its totient is φ = 9003755520.

The previous prime is 21008763089. The next prime is 21008763107. The reversal of 21008763104 is 40136780012.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21008763107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46894337 + ... + 46894784.

It is an arithmetic number, because the mean of its divisors is an integer number (1969571562).

Almost surely, 2^21008763104 is an apocalyptic number.

It is an amenable number.

21008763104 is an abundant number, since it is smaller than the sum of its proper divisors (26260954384).

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

21008763104 is an equidigital number, since it uses as much as digits as its factorization.

21008763104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93789138 (or 93789130 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

Adding to 21008763104 its sum of digits (32), we get a square (21008763136 = 144944²).

The spelling of 21008763104 in words is "twenty-one billion, eight million, seven hundred sixty-three thousand, one hundred four".