20112122121 has 16 divisors (see below), whose sum is σ = 33004508544. Its totient is φ = 10608591744.

The previous prime is 20112122111. The next prime is 20112122197. The reversal of 20112122121 is 12122121102.

It is not a de Polignac number, because 20112122121 - 2⁵ = 20112122089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20112122121.

It is not an unprimeable number, because it can be changed into a prime (20112122111) 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, 36835116 + ... + 36835661.

It is an arithmetic number, because the mean of its divisors is an integer number (2062781784).

Almost surely, 2^20112122121 is an apocalyptic number.

20112122121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20112122121 is a deficient number, since it is larger than the sum of its proper divisors (12892386423).

20112122121 is a wasteful number, since it uses less digits than its factorization.

20112122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73670800.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 20112122121 its reverse (12122121102), we get a palindrome (32234243223).

The spelling of 20112122121 in words is "twenty billion, one hundred twelve million, one hundred twenty-two thousand, one hundred twenty-one".