21532513200 has 480 divisors, whose sum is σ = 78593255424. Its totient is φ = 4992000000.

The previous prime is 21532513199. The next prime is 21532513279. The reversal of 21532513200 is 231523512.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 41328940 + ... + 41329460.

Almost surely, 2^21532513200 is an apocalyptic number.

21532513200 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 21532513200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39296627712).

21532513200 is an abundant number, since it is smaller than the sum of its proper divisors (57060742224).

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

21532513200 is a wasteful number, since it uses less digits than its factorization.

21532513200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 685 (or 674 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

The spelling of 21532513200 in words is "twenty-one billion, five hundred thirty-two million, five hundred thirteen thousand, two hundred".