21404505357360 has 200 divisors, whose sum is σ = 74346730909440. Its totient is φ = 5707429475328.

The previous prime is 21404505357349. The next prime is 21404505357373. The reversal of 21404505357360 is 6375350540412.

21404505357360 is a `hidden beast` number, since 2 + 1 + 4 + 0 + 4 + 50 + 535 + 7 + 3 + 60 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 89038284 + ... + 89278356.

Almost surely, 2^{21404505357360} is an apocalyptic number.

21404505357360 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 21404505357360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37173365454720).

21404505357360 is an abundant number, since it is smaller than the sum of its proper divisors (52942225552080).

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

21404505357360 is a wasteful number, since it uses less digits than its factorization.

21404505357360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253857 (or 253842 counting only the distinct ones).

The product of its (nonzero) digits is 1512000, while the sum is 45.

Adding to 21404505357360 its reverse (6375350540412), we get a palindrome (27779855897772).

The spelling of 21404505357360 in words is "twenty-one trillion, four hundred four billion, five hundred five million, three hundred fifty-seven thousand, three hundred sixty".