20110122009 has 12 divisors (see below), whose sum is σ = 29329974336. Its totient is φ = 13276584792.

The previous prime is 20110121971. The next prime is 20110122017. The reversal of 20110122009 is 90022101102.

It is not a de Polignac number, because 20110122009 - 2⁸ = 20110121753 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20110121982 and 20110122000.

It is not an unprimeable number, because it can be changed into a prime (20110122029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10845957 + ... + 10847810.

It is an arithmetic number, because the mean of its divisors is an integer number (2444164528).

Almost surely, 2^20110122009 is an apocalyptic number.

It is an amenable number.

20110122009 is a deficient number, since it is larger than the sum of its proper divisors (9219852327).

20110122009 is a wasteful number, since it uses less digits than its factorization.

20110122009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21693876 (or 21693873 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

It can be divided in two parts, 2011012 and 2009, that added together give a triangular number (2013021 = T₂₀₀₆).

The spelling of 20110122009 in words is "twenty billion, one hundred ten million, one hundred twenty-two thousand, nine".