20121122011 has 2 divisors, whose sum is σ = 20121122012. Its totient is φ = 20121122010.

The previous prime is 20121121991. The next prime is 20121122027. The reversal of 20121122011 is 11022112102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20121122011 - 2⁹ = 20121121499 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20121121982 and 20121122000.

It is not a weakly prime, because it can be changed into another prime (20121122111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060561005 + 10060561006.

It is an arithmetic number, because the mean of its divisors is an integer number (10060561006).

Almost surely, 2^20121122011 is an apocalyptic number.

20121122011 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121122011 is an equidigital number, since it uses as much as digits as its factorization.

20121122011 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 13.

Adding to 20121122011 its reverse (11022112102), we get a palindrome (31143234113).

Subtracting from 20121122011 its reverse (11022112102), we obtain a palindrome (9099009909).

The spelling of 20121122011 in words is "twenty billion, one hundred twenty-one million, one hundred twenty-two thousand, eleven".