21701331384 has 128 divisors (see below), whose sum is σ = 58316544000. Its totient is φ = 6709094784.

The previous prime is 21701331361. The next prime is 21701331389. The reversal of 21701331384 is 48313310712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21701331389) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7074219 + ... + 7077285.

It is an arithmetic number, because the mean of its divisors is an integer number (455598000).

Almost surely, 2^21701331384 is an apocalyptic number.

21701331384 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 21701331384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29158272000).

21701331384 is an abundant number, since it is smaller than the sum of its proper divisors (36615212616).

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

21701331384 is a wasteful number, since it uses less digits than its factorization.

21701331384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3417 (or 3413 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The spelling of 21701331384 in words is "twenty-one billion, seven hundred one million, three hundred thirty-one thousand, three hundred eighty-four".