20011211111057 has 2 divisors, whose sum is σ = 20011211111058. Its totient is φ = 20011211111056.

The previous prime is 20011211111027. The next prime is 20011211111071. The reversal of 20011211111057 is 75011111211002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16695428688016 + 3315782423041 = 4086004^2 + 1820929^2 .

It is a cyclic number.

It is not a de Polignac number, because 20011211111057 - 2³⁸ = 19736333204113 is a prime.

It is a super-2 number, since 2×20011211111057² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20011211111027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005605555528 + 10005605555529.

It is an arithmetic number, because the mean of its divisors is an integer number (10005605555529).

Almost surely, 2^{20011211111057} is an apocalyptic number.

It is an amenable number.

20011211111057 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011211111057 is an equidigital number, since it uses as much as digits as its factorization.

20011211111057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 140, while the sum is 23.

Adding to 20011211111057 its reverse (75011111211002), we get a palindrome (95022322322059).

The spelling of 20011211111057 in words is "twenty trillion, eleven billion, two hundred eleven million, one hundred eleven thousand, fifty-seven".