21753447000 has 128 divisors (see below), whose sum is σ = 69705455040. Its totient is φ = 5644108800.

The previous prime is 21753446987. The next prime is 21753447029. The reversal of 21753447000 is 74435712.

It is a super-4 number, since 4×21753447000⁴ (a number of 42 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13012 + ... + 208988.

Almost surely, 2^21753447000 is an apocalyptic number.

21753447000 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 21753447000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34852727520).

21753447000 is an abundant number, since it is smaller than the sum of its proper divisors (47952008040).

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

21753447000 is a wasteful number, since it uses less digits than its factorization.

21753447000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196038 (or 196024 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 33.

The spelling of 21753447000 in words is "twenty-one billion, seven hundred fifty-three million, four hundred forty-seven thousand".