21313815022050 has 192 divisors, whose sum is σ = 54470210350080. Its totient is φ = 5511416359680.

The previous prime is 21313815022043. The next prime is 21313815022079. The reversal of 21313815022050 is 5022051831312.

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, 3750448509 + ... + 3750454191.

It is an arithmetic number, because the mean of its divisors is an integer number (283699012240).

Almost surely, 2^{21313815022050} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21313815022050, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27235105175040).

21313815022050 is an abundant number, since it is smaller than the sum of its proper divisors (33156395328030).

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

21313815022050 is a wasteful number, since it uses less digits than its factorization.

21313815022050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7897 (or 7892 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 33.

Adding to 21313815022050 its reverse (5022051831312), we get a palindrome (26335866853362).

The spelling of 21313815022050 in words is "twenty-one trillion, three hundred thirteen billion, eight hundred fifteen million, twenty-two thousand, fifty".