10121301991 has 2 divisors, whose sum is σ = 10121301992. Its totient is φ = 10121301990.

The previous prime is 10121301989. The next prime is 10121302001. The reversal of 10121301991 is 19910312101.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 10121301991 - 2¹ = 10121301989 is a prime.

Together with 10121301989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10121301391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5060650995 + 5060650996.

It is an arithmetic number, because the mean of its divisors is an integer number (5060650996).

Almost surely, 2^10121301991 is an apocalyptic number.

10121301991 is a deficient number, since it is larger than the sum of its proper divisors (1).

10121301991 is an equidigital number, since it uses as much as digits as its factorization.

10121301991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486, while the sum is 28.

The spelling of 10121301991 in words is "ten billion, one hundred twenty-one million, three hundred one thousand, nine hundred ninety-one".