21078933504 has 136 divisors (see below), whose sum is σ = 58164066960. Its totient is φ = 6782189568.

The previous prime is 21078933457. The next prime is 21078933563. The reversal of 21078933504 is 40533987012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5699784 + ... + 5703480.

Almost surely, 2^21078933504 is an apocalyptic number.

21078933504 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21078933504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29082033480).

21078933504 is an abundant number, since it is smaller than the sum of its proper divisors (37085133456).

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

21078933504 is an frugal number, since it uses more digits than its factorization.

21078933504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3761 (or 3731 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 42.

The spelling of 21078933504 in words is "twenty-one billion, seventy-eight million, nine hundred thirty-three thousand, five hundred four".