21393186309488 has 160 divisors (see below), whose sum is σ = 47845157952000. Its totient is φ = 9077162185728.

The previous prime is 21393186309449. The next prime is 21393186309503. The reversal of 21393186309488 is 88490368139312.

It is a hoax number, since the sum of its digits (65) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8392774838 + ... + 8392777386.

It is an arithmetic number, because the mean of its divisors is an integer number (299032237200).

Almost surely, 2^{21393186309488} is an apocalyptic number.

21393186309488 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 21393186309488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23922578976000).

21393186309488 is an abundant number, since it is smaller than the sum of its proper divisors (26451971642512).

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

21393186309488 is a wasteful number, since it uses less digits than its factorization.

21393186309488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4319 (or 4313 counting only the distinct ones).

The product of its (nonzero) digits is 53747712, while the sum is 65.

The spelling of 21393186309488 in words is "twenty-one trillion, three hundred ninety-three billion, one hundred eighty-six million, three hundred nine thousand, four hundred eighty-eight".