21502316465250 has 256 divisors, whose sum is σ = 56191548801024. Its totient is φ = 5470672896000.

The previous prime is 21502316465233. The next prime is 21502316465261. The reversal of 21502316465250 is 5256461320512.

It is a super-2 number, since 2×21502316465250² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 3951902530 + ... + 3951907970.

It is an arithmetic number, because the mean of its divisors is an integer number (219498237504).

Almost surely, 2^{21502316465250} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21502316465250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28095774400512).

21502316465250 is an abundant number, since it is smaller than the sum of its proper divisors (34689232335774).

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

21502316465250 is a wasteful number, since it uses less digits than its factorization.

21502316465250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8238 (or 8228 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 42.

Adding to 21502316465250 its reverse (5256461320512), we get a palindrome (26758777785762).

The spelling of 21502316465250 in words is "twenty-one trillion, five hundred two billion, three hundred sixteen million, four hundred sixty-five thousand, two hundred fifty".