20111121047 has 2 divisors, whose sum is σ = 20111121048. Its totient is φ = 20111121046.

The previous prime is 20111121013. The next prime is 20111121061. The reversal of 20111121047 is 74012111102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20111121047 - 2⁶ = 20111120983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20111121067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055560523 + 10055560524.

It is an arithmetic number, because the mean of its divisors is an integer number (10055560524).

Almost surely, 2^20111121047 is an apocalyptic number.

20111121047 is a deficient number, since it is larger than the sum of its proper divisors (1).

20111121047 is an equidigital number, since it uses as much as digits as its factorization.

20111121047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 20.

Adding to 20111121047 its reverse (74012111102), we get a palindrome (94123232149).

The spelling of 20111121047 in words is "twenty billion, one hundred eleven million, one hundred twenty-one thousand, forty-seven".