21383144960 has 160 divisors (see below), whose sum is σ = 52516728000. Its totient is φ = 8347484160.

The previous prime is 21383144953. The next prime is 21383144971. The reversal of 21383144960 is 6944138312.

It is a tau number, because it is divible by the number of its divisors (160).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23267381 + ... + 23268299.

It is an arithmetic number, because the mean of its divisors is an integer number (328229550).

Almost surely, 2^21383144960 is an apocalyptic number.

21383144960 is a gapful number since it is divisible by the number (20) 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 21383144960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26258364000).

21383144960 is an abundant number, since it is smaller than the sum of its proper divisors (31133583040).

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

21383144960 is an equidigital number, since it uses as much as digits as its factorization.

21383144960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1152 (or 1136 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 41.

The spelling of 21383144960 in words is "twenty-one billion, three hundred eighty-three million, one hundred forty-four thousand, nine hundred sixty".