10221021993 has 16 divisors (see below), whose sum is σ = 16772959616. Its totient is φ = 5391308160.

The previous prime is 10221021971. The next prime is 10221022037. The reversal of 10221021993 is 39912012201.

It is not a de Polignac number, because 10221021993 - 2⁵ = 10221021961 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 10221021993.

It is not an unprimeable number, because it can be changed into a prime (10221021913) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18719548 + ... + 18720093.

It is an arithmetic number, because the mean of its divisors is an integer number (1048309976).

Almost surely, 2^10221021993 is an apocalyptic number.

10221021993 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

10221021993 is a deficient number, since it is larger than the sum of its proper divisors (6551937623).

10221021993 is a wasteful number, since it uses less digits than its factorization.

10221021993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37439664.

The product of its (nonzero) digits is 1944, while the sum is 30.

The spelling of 10221021993 in words is "ten billion, two hundred twenty-one million, twenty-one thousand, nine hundred ninety-three".