211020311057 has 2 divisors, whose sum is σ = 211020311058. Its totient is φ = 211020311056.

The previous prime is 211020311023. The next prime is 211020311077. The reversal of 211020311057 is 750113020112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 127546122496 + 83474188561 = 357136^2 + 288919^2 .

It is a cyclic number.

It is not a de Polignac number, because 211020311057 - 2⁶ = 211020310993 is a prime.

It is not a weakly prime, because it can be changed into another prime (211020311077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105510155528 + 105510155529.

It is an arithmetic number, because the mean of its divisors is an integer number (105510155529).

Almost surely, 2^211020311057 is an apocalyptic number.

It is an amenable number.

211020311057 is a deficient number, since it is larger than the sum of its proper divisors (1).

211020311057 is an equidigital number, since it uses as much as digits as its factorization.

211020311057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 420, while the sum is 23.

Adding to 211020311057 its reverse (750113020112), we get a palindrome (961133331169).

The spelling of 211020311057 in words is "two hundred eleven billion, twenty million, three hundred eleven thousand, fifty-seven".