1211310221057 has 2 divisors, whose sum is σ = 1211310221058. Its totient is φ = 1211310221056.

The previous prime is 1211310220973. The next prime is 1211310221081. The reversal of 1211310221057 is 7501220131121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 997793218816 + 213517002241 = 998896^2 + 462079^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211310221057 - 2⁸ = 1211310220801 is a prime.

It is not a weakly prime, because it can be changed into another prime (1211310251057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605655110528 + 605655110529.

It is an arithmetic number, because the mean of its divisors is an integer number (605655110529).

Almost surely, 2^{1211310221057} is an apocalyptic number.

It is an amenable number.

1211310221057 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211310221057 is an equidigital number, since it uses as much as digits as its factorization.

1211310221057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 840, while the sum is 26.

Adding to 1211310221057 its reverse (7501220131121), we get a palindrome (8712530352178).

The spelling of 1211310221057 in words is "one trillion, two hundred eleven billion, three hundred ten million, two hundred twenty-one thousand, fifty-seven".