20112112121 has 2 divisors, whose sum is σ = 20112112122. Its totient is φ = 20112112120.

The previous prime is 20112112117. The next prime is 20112112159. The reversal of 20112112121 is 12121121102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19884102121 + 228010000 = 141011^2 + 15100^2 .

It is a cyclic number.

It is not a de Polignac number, because 20112112121 - 2² = 20112112117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20112112096 and 20112112105.

It is not a weakly prime, because it can be changed into another prime (20112112721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10056056060 + 10056056061.

It is an arithmetic number, because the mean of its divisors is an integer number (10056056061).

Almost surely, 2^20112112121 is an apocalyptic number.

It is an amenable number.

20112112121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20112112121 is an equidigital number, since it uses as much as digits as its factorization.

20112112121 is an odious number, because the sum of its binary digits is odd.

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

Adding to 20112112121 its reverse (12121121102), we get a palindrome (32233233223).

The spelling of 20112112121 in words is "twenty billion, one hundred twelve million, one hundred twelve thousand, one hundred twenty-one".