21389003888 has 80 divisors (see below), whose sum is σ = 48857301504. Its totient is φ = 8881678080.

The previous prime is 21389003873. The next prime is 21389003891. The reversal of 21389003888 is 88830098312.

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, 434381 + ... + 481107.

Almost surely, 2^21389003888 is an apocalyptic number.

21389003888 is a gapful number since it is divisible by the number (28) 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 21389003888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24428650752).

21389003888 is an abundant number, since it is smaller than the sum of its proper divisors (27468297616).

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

21389003888 is a wasteful number, since it uses less digits than its factorization.

21389003888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46870 (or 46864 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 50.

The spelling of 21389003888 in words is "twenty-one billion, three hundred eighty-nine million, three thousand, eight hundred eighty-eight".