10111021993 has 2 divisors, whose sum is σ = 10111021994. Its totient is φ = 10111021992.

The previous prime is 10111021981. The next prime is 10111021997. The reversal of 10111021993 is 39912011101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8646582169 + 1464439824 = 92987^2 + 38268^2 .

It is a cyclic number.

It is not a de Polignac number, because 10111021993 - 2⁵ = 10111021961 is a prime.

It is not a weakly prime, because it can be changed into another prime (10111021997) 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, 5055510996 + 5055510997.

It is an arithmetic number, because the mean of its divisors is an integer number (5055510997).

Almost surely, 2^10111021993 is an apocalyptic number.

It is an amenable number.

10111021993 is a deficient number, since it is larger than the sum of its proper divisors (1).

10111021993 is an equidigital number, since it uses as much as digits as its factorization.

10111021993 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 10111021993 in words is "ten billion, one hundred eleven million, twenty-one thousand, nine hundred ninety-three".