21047400384 has 112 divisors (see below), whose sum is σ = 56160448512. Its totient is φ = 6956531712.

The previous prime is 21047400337. The next prime is 21047400419. The reversal of 21047400384 is 48300474012.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 14191707 + ... + 14193189.

It is an arithmetic number, because the mean of its divisors is an integer number (501432576).

Almost surely, 2^21047400384 is an apocalyptic number.

21047400384 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 21047400384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28080224256).

21047400384 is an abundant number, since it is smaller than the sum of its proper divisors (35113048128).

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

21047400384 is a wasteful number, since it uses less digits than its factorization.

21047400384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2074 (or 2064 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 33.

Adding to 21047400384 its reverse (48300474012), we get a palindrome (69347874396).

The spelling of 21047400384 in words is "twenty-one billion, forty-seven million, four hundred thousand, three hundred eighty-four".