10021221191 has 2 divisors, whose sum is σ = 10021221192. Its totient is φ = 10021221190.

The previous prime is 10021221173. The next prime is 10021221239. The reversal of 10021221191 is 19112212001.

10021221191 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10021221191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10021221151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5010610595 + 5010610596.

It is an arithmetic number, because the mean of its divisors is an integer number (5010610596).

Almost surely, 2^10021221191 is an apocalyptic number.

10021221191 is a deficient number, since it is larger than the sum of its proper divisors (1).

10021221191 is an equidigital number, since it uses as much as digits as its factorization.

10021221191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 20.

Adding to 10021221191 its reverse (19112212001), we get a palindrome (29133433192).

The spelling of 10021221191 in words is "ten billion, twenty-one million, two hundred twenty-one thousand, one hundred ninety-one".