21483436947840 has 320 divisors, whose sum is σ = 87681409817760. Its totient is φ = 4910499790848.

The previous prime is 21483436947829. The next prime is 21483436947887. The reversal of 21483436947840 is 4874963438412.

21483436947840 is a `hidden beast` number, since 2 + 1 + 4 + 8 + 3 + 436 + 94 + 78 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (320).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 29238417 + ... + 29964176.

Almost surely, 2^{21483436947840} is an apocalyptic number.

21483436947840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21483436947840 is an abundant number, since it is smaller than the sum of its proper divisors (66197972869920).

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

21483436947840 is an equidigital number, since it uses as much as digits as its factorization.

21483436947840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59202631 (or 59202610 counting only the distinct ones).

The product of its (nonzero) digits is 111476736, while the sum is 63.

The spelling of 21483436947840 in words is "twenty-one trillion, four hundred eighty-three billion, four hundred thirty-six million, nine hundred forty-seven thousand, eight hundred forty".