21731845200 has 240 divisors, whose sum is σ = 75422047680. Its totient is φ = 5348728320.

The previous prime is 21731845193. The next prime is 21731845231. The reversal of 21731845200 is 254813712.

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

It is a congruent number.

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, 2632279 + ... + 2640521.

It is an arithmetic number, because the mean of its divisors is an integer number (314258532).

Almost surely, 2^21731845200 is an apocalyptic number.

21731845200 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 21731845200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37711023840).

21731845200 is an abundant number, since it is smaller than the sum of its proper divisors (53690202480).

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

21731845200 is a wasteful number, since it uses less digits than its factorization.

21731845200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8303 (or 8266 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 33.

The spelling of 21731845200 in words is "twenty-one billion, seven hundred thirty-one million, eight hundred forty-five thousand, two hundred".