10121999 has 2 divisors, whose sum is σ = 10122000. Its totient is φ = 10121998.

The previous prime is 10121963. The next prime is 10122011. The reversal of 10121999 is 99912101.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 10121999 - 2⁸ = 10121743 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10121939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5060999 + 5061000.

It is an arithmetic number, because the mean of its divisors is an integer number (5061000).

Almost surely, 2^10121999 is an apocalyptic number.

10121999 is a deficient number, since it is larger than the sum of its proper divisors (1).

10121999 is an equidigital number, since it uses as much as digits as its factorization.

10121999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1458, while the sum is 32.

The square root of 10121999 is about 3181.5089187365. The cubic root of 10121999 is about 216.3160596515.

The spelling of 10121999 in words is "ten million, one hundred twenty-one thousand, nine hundred ninety-nine".