21393373584 has 80 divisors (see below), whose sum is σ = 60450059520. Its totient is φ = 6465674880.

The previous prime is 21393373583. The next prime is 21393373667. The reversal of 21393373584 is 48537339312.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (21393373583) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 146659 + ... + 253565.

It is an arithmetic number, because the mean of its divisors is an integer number (755625744).

Almost surely, 2^21393373584 is an apocalyptic number.

21393373584 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 21393373584, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30225029760).

21393373584 is an abundant number, since it is smaller than the sum of its proper divisors (39056685936).

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

21393373584 is a wasteful number, since it uses less digits than its factorization.

21393373584 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107308 (or 107302 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 48.

The spelling of 21393373584 in words is "twenty-one billion, three hundred ninety-three million, three hundred seventy-three thousand, five hundred eighty-four".