21044243250 has 192 divisors, whose sum is σ = 60208237440. Its totient is φ = 5288976000.

The previous prime is 21044243249. The next prime is 21044243263. The reversal of 21044243250 is 5234244012.

21044243250 is a `hidden beast` number, since 210 + 4 + 424 + 3 + 25 + 0 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 9019084 + ... + 9021416.

It is an arithmetic number, because the mean of its divisors is an integer number (313584570).

Almost surely, 2^21044243250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21044243250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30104118720).

21044243250 is an abundant number, since it is smaller than the sum of its proper divisors (39163994190).

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

21044243250 is a wasteful number, since it uses less digits than its factorization.

21044243250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2586 (or 2573 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

Adding to 21044243250 its reverse (5234244012), we get a palindrome (26278487262).

The spelling of 21044243250 in words is "twenty-one billion, forty-four million, two hundred forty-three thousand, two hundred fifty".