21265944200 has 96 divisors (see below), whose sum is σ = 51127441920. Its totient is φ = 8217600000.

The previous prime is 21265944197. The next prime is 21265944223. The reversal of 21265944200 is 244956212.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3971525 + ... + 3976875.

It is an arithmetic number, because the mean of its divisors is an integer number (532577520).

Almost surely, 2^21265944200 is an apocalyptic number.

21265944200 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 21265944200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25563720960).

21265944200 is an abundant number, since it is smaller than the sum of its proper divisors (29861497720).

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

21265944200 is a wasteful number, since it uses less digits than its factorization.

21265944200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6039 (or 6030 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 35.

The spelling of 21265944200 in words is "twenty-one billion, two hundred sixty-five million, nine hundred forty-four thousand, two hundred".