21243032250 has 96 divisors (see below), whose sum is σ = 58281297984. Its totient is φ = 5149804000.

The previous prime is 21243032249. The next prime is 21243032273. The reversal of 21243032250 is 5223034212.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21243032250.

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, 26292 + ... + 207791.

It is an arithmetic number, because the mean of its divisors is an integer number (607096854).

Almost surely, 2^21243032250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21243032250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29140648992).

21243032250 is an abundant number, since it is smaller than the sum of its proper divisors (37038265734).

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

21243032250 is a wasteful number, since it uses less digits than its factorization.

21243032250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234125 (or 234104 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 24.

Adding to 21243032250 its reverse (5223034212), we get a palindrome (26466066462).

The spelling of 21243032250 in words is "twenty-one billion, two hundred forty-three million, thirty-two thousand, two hundred fifty".