21115316750 has 256 divisors, whose sum is σ = 47357706240. Its totient is φ = 7027680000.

The previous prime is 21115316743. The next prime is 21115316771. The reversal of 21115316750 is 5761351112.

It is a congruent number.

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, 237250706 + ... + 237250794.

It is an arithmetic number, because the mean of its divisors is an integer number (184991040).

Almost surely, 2^21115316750 is an apocalyptic number.

21115316750 is an abundant number, since it is smaller than the sum of its proper divisors (26242389490).

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

21115316750 is a wasteful number, since it uses less digits than its factorization.

21115316750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193 (or 161 counting only the distinct ones).

The product of its (nonzero) digits is 6300, while the sum is 32.

Adding to 21115316750 its reverse (5761351112), we get a palindrome (26876667862).

The spelling of 21115316750 in words is "twenty-one billion, one hundred fifteen million, three hundred sixteen thousand, seven hundred fifty".