21545001360 has 240 divisors, whose sum is σ = 76769372160. Its totient is φ = 5399654400.

The previous prime is 21545001319. The next prime is 21545001419. The reversal of 21545001360 is 6310054512.

21545001360 is a `hidden beast` number, since 2 + 154 + 500 + 1 + 3 + 6 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1731160 + ... + 1743560.

It is an arithmetic number, because the mean of its divisors is an integer number (319872384).

Almost surely, 2^21545001360 is an apocalyptic number.

21545001360 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 21545001360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38384686080).

21545001360 is an abundant number, since it is smaller than the sum of its proper divisors (55224370800).

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

21545001360 is a wasteful number, since it uses less digits than its factorization.

21545001360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12566 (or 12557 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

Adding to 21545001360 its reverse (6310054512), we get a palindrome (27855055872).

The spelling of 21545001360 in words is "twenty-one billion, five hundred forty-five million, one thousand, three hundred sixty".