21333323250 has 192 divisors, whose sum is σ = 58978782720. Its totient is φ = 5562432000.

The previous prime is 21333323243. The next prime is 21333323269. The reversal of 21333323250 is 5232333312.

21333323250 is a `hidden beast` number, since 2 + 1 + 3 + 3 + 332 + 325 + 0 = 666.

It is a super-2 number, since 2×21333323250² (a number of 21 digits) contains 22 as substring.

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, 35974954 + ... + 35975546.

It is an arithmetic number, because the mean of its divisors is an integer number (307181160).

Almost surely, 2^21333323250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21333323250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29489391360).

21333323250 is an abundant number, since it is smaller than the sum of its proper divisors (37645459470).

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

21333323250 is a wasteful number, since it uses less digits than its factorization.

21333323250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 946 (or 933 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 27.

Adding to 21333323250 its reverse (5232333312), we get a palindrome (26565656562).

The spelling of 21333323250 in words is "twenty-one billion, three hundred thirty-three million, three hundred twenty-three thousand, two hundred fifty".