20211311121047 has 2 divisors, whose sum is σ = 20211311121048. Its totient is φ = 20211311121046.

The previous prime is 20211311121037. The next prime is 20211311121137. The reversal of 20211311121047 is 74012111311202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20211311121047 - 2⁴ = 20211311121031 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20211311121037) 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 as a sum of consecutive naturals, namely, 10105655560523 + 10105655560524.

It is an arithmetic number, because the mean of its divisors is an integer number (10105655560524).

Almost surely, 2^{20211311121047} is an apocalyptic number.

20211311121047 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211311121047 is an equidigital number, since it uses as much as digits as its factorization.

20211311121047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 26.

Adding to 20211311121047 its reverse (74012111311202), we get a palindrome (94223422432249).

The spelling of 20211311121047 in words is "twenty trillion, two hundred eleven billion, three hundred eleven million, one hundred twenty-one thousand, forty-seven".