10191220191 has 12 divisors (see below), whose sum is σ = 14752868832. Its totient is φ = 6779277216.

The previous prime is 10191220187. The next prime is 10191220201. The reversal of 10191220191 is 19102219101.

It is not a de Polignac number, because 10191220191 - 2² = 10191220187 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10191220111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1234791 + ... + 1243016.

It is an arithmetic number, because the mean of its divisors is an integer number (1229405736).

Almost surely, 2^10191220191 is an apocalyptic number.

10191220191 is a deficient number, since it is larger than the sum of its proper divisors (4561648641).

10191220191 is a wasteful number, since it uses less digits than its factorization.

10191220191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2478270 (or 2478267 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 27.

Adding to 10191220191 its reverse (19102219101), we get a palindrome (29293439292).

The spelling of 10191220191 in words is "ten billion, one hundred ninety-one million, two hundred twenty thousand, one hundred ninety-one".