10001121999 has 16 divisors (see below), whose sum is σ = 14731230720. Its totient is φ = 5984559360.

The previous prime is 10001121967. The next prime is 10001122007. The reversal of 10001121999 is 99912110001.

It is not a de Polignac number, because 10001121999 - 2⁵ = 10001121967 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10001121499) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1915522 + ... + 1920735.

It is an arithmetic number, because the mean of its divisors is an integer number (920701920).

Almost surely, 2^10001121999 is an apocalyptic number.

10001121999 is a deficient number, since it is larger than the sum of its proper divisors (4730108721).

10001121999 is a wasteful number, since it uses less digits than its factorization.

10001121999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3836350.

The product of its (nonzero) digits is 1458, while the sum is 33.

The spelling of 10001121999 in words is "ten billion, one million, one hundred twenty-one thousand, nine hundred ninety-nine".