10121111999 has 4 divisors (see below), whose sum is σ = 10147817160. Its totient is φ = 10094406840.

The previous prime is 10121111927. The next prime is 10121112041. The reversal of 10121111999 is 99911112101.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 10121111999 - 2³² = 5826144703 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10121111909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13352012 + ... + 13352769.

It is an arithmetic number, because the mean of its divisors is an integer number (2536954290).

Almost surely, 2^10121111999 is an apocalyptic number.

10121111999 is a deficient number, since it is larger than the sum of its proper divisors (26705161).

10121111999 is an equidigital number, since it uses as much as digits as its factorization.

10121111999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26705160.

The product of its (nonzero) digits is 1458, while the sum is 35.

The spelling of 10121111999 in words is "ten billion, one hundred twenty-one million, one hundred eleven thousand, nine hundred ninety-nine".