9921915250 has 32 divisors (see below), whose sum is σ = 20002587696. Its totient is φ = 3663475200.

The previous prime is 9921915247. The next prime is 9921915251. The reversal of 9921915250 is 525191299.

9921915250 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 345922801 + 9575992449 = 18599^2 + 97857^2 .

It is a junction number, because it is equal to n+sod(n) for n = 9921915197 and 9921915206.

It is not an unprimeable number, because it can be changed into a prime (9921915251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1523199 + ... + 1529698.

Almost surely, 2^9921915250 is an apocalyptic number.

9921915250 is an abundant number, since it is smaller than the sum of its proper divisors (10080672446).

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

9921915250 is a wasteful number, since it uses less digits than its factorization.

9921915250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3052927 (or 3052917 counting only the distinct ones).

The product of its (nonzero) digits is 72900, while the sum is 43.

The square root of 9921915250 is about 99608.8111062470. The cubic root of 9921915250 is about 2148.8124142674.

The spelling of 9921915250 in words is "nine billion, nine hundred twenty-one million, nine hundred fifteen thousand, two hundred fifty".