21384207360 has 220 divisors, whose sum is σ = 76630394808. Its totient is φ = 5702344704.

The previous prime is 21384207347. The next prime is 21384207421. The reversal of 21384207360 is 6370248312.

It is a happy number.

21384207360 is a `hidden beast` number, since 2 + 13 + 84 + 207 + 360 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 388939 + ... + 440501.

Almost surely, 2^21384207360 is an apocalyptic number.

21384207360 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 21384207360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38315197404).

21384207360 is an abundant number, since it is smaller than the sum of its proper divisors (55246187448).

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

21384207360 is an equidigital number, since it uses as much as digits as its factorization.

21384207360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51600 (or 51573 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The spelling of 21384207360 in words is "twenty-one billion, three hundred eighty-four million, two hundred seven thousand, three hundred sixty".