21793545984 has 144 divisors (see below), whose sum is σ = 69777908480. Its totient is φ = 5898977280.

The previous prime is 21793545959. The next prime is 21793545997. The reversal of 21793545984 is 48954539712.

It is a Harshad number since it is a multiple of its sum of digits (57).

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, 4537 + ... + 208824.

Almost surely, 2^21793545984 is an apocalyptic number.

21793545984 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 21793545984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34888954240).

21793545984 is an abundant number, since it is smaller than the sum of its proper divisors (47984362496).

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

21793545984 is a wasteful number, since it uses less digits than its factorization.

21793545984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213406 (or 213392 counting only the distinct ones).

The product of its digits is 10886400, while the sum is 57.

The spelling of 21793545984 in words is "twenty-one billion, seven hundred ninety-three million, five hundred forty-five thousand, nine hundred eighty-four".