20110120999 has 4 divisors (see below), whose sum is σ = 21168548440. Its totient is φ = 19051693560.

The previous prime is 20110120993. The next prime is 20110121023. The reversal of 20110120999 is 99902101102.

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 20110120999 - 2⁵ = 20110120967 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 (20110120993) 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, 529213692 + ... + 529213729.

It is an arithmetic number, because the mean of its divisors is an integer number (5292137110).

Almost surely, 2^20110120999 is an apocalyptic number.

20110120999 is a deficient number, since it is larger than the sum of its proper divisors (1058427441).

20110120999 is a wasteful number, since it uses less digits than its factorization.

20110120999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1058427440.

The product of its (nonzero) digits is 2916, while the sum is 34.

The spelling of 20110120999 in words is "twenty billion, one hundred ten million, one hundred twenty thousand, nine hundred ninety-nine".