20112121121 has 16 divisors (see below), whose sum is σ = 20936361600. Its totient is φ = 19306750848.

The previous prime is 20112121111. The next prime is 20112121147. The reversal of 20112121121 is 12112121102.

It is a cyclic number.

It is not a de Polignac number, because 20112121121 - 2¹⁰ = 20112120097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20112121096 and 20112121105.

It is not an unprimeable number, because it can be changed into a prime (20112121111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 623375 + ... + 654843.

It is an arithmetic number, because the mean of its divisors is an integer number (1308522600).

Almost surely, 2^20112121121 is an apocalyptic number.

It is an amenable number.

20112121121 is a deficient number, since it is larger than the sum of its proper divisors (824240479).

20112121121 is a wasteful number, since it uses less digits than its factorization.

20112121121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31768.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 20112121121 its reverse (12112121102), we get a palindrome (32224242223).

The spelling of 20112121121 in words is "twenty billion, one hundred twelve million, one hundred twenty-one thousand, one hundred twenty-one".