21455513200 has 240 divisors, whose sum is σ = 60120652032. Its totient is φ = 7279360000.

The previous prime is 21455513179. The next prime is 21455513213. The reversal of 21455513200 is 231555412.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4146615 + ... + 4151785.

Almost surely, 2^21455513200 is an apocalyptic number.

21455513200 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 21455513200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30060326016).

21455513200 is an abundant number, since it is smaller than the sum of its proper divisors (38665138832).

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

21455513200 is a wasteful number, since it uses less digits than its factorization.

21455513200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5264 (or 5253 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 28.

The spelling of 21455513200 in words is "twenty-one billion, four hundred fifty-five million, five hundred thirteen thousand, two hundred".