211020201221057 has 2 divisors, whose sum is σ = 211020201221058. Its totient is φ = 211020201221056.

The previous prime is 211020201221029. The next prime is 211020201221101. The reversal of 211020201221057 is 750122102020112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 189209956240321 + 21810244980736 = 13755361^2 + 4670144^2 .

It is a cyclic number.

It is not a de Polignac number, because 211020201221057 - 2¹⁰ = 211020201220033 is a prime.

It is not a weakly prime, because it can be changed into another prime (211020201521057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105510100610528 + 105510100610529.

It is an arithmetic number, because the mean of its divisors is an integer number (105510100610529).

Almost surely, 2^{211020201221057} is an apocalyptic number.

It is an amenable number.

211020201221057 is a deficient number, since it is larger than the sum of its proper divisors (1).

211020201221057 is an equidigital number, since it uses as much as digits as its factorization.

211020201221057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1120, while the sum is 26.

Adding to 211020201221057 its reverse (750122102020112), we get a palindrome (961142303241169).

The spelling of 211020201221057 in words is "two hundred eleven trillion, twenty billion, two hundred one million, two hundred twenty-one thousand, fifty-seven".