1211222012057 has 2 divisors, whose sum is σ = 1211222012058. Its totient is φ = 1211222012056.

The previous prime is 1211222012023. The next prime is 1211222012071. The reversal of 1211222012057 is 7502102221121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 996435182656 + 214786829401 = 998216^2 + 463451^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211222012057 - 2²⁰ = 1211220963481 is a prime.

It is not a weakly prime, because it can be changed into another prime (1211222092057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605611006028 + 605611006029.

It is an arithmetic number, because the mean of its divisors is an integer number (605611006029).

Almost surely, 2^{1211222012057} is an apocalyptic number.

It is an amenable number.

1211222012057 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211222012057 is an equidigital number, since it uses as much as digits as its factorization.

1211222012057 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 1211222012057 its reverse (7502102221121), we get a palindrome (8713324233178).

The spelling of 1211222012057 in words is "one trillion, two hundred eleven billion, two hundred twenty-two million, twelve thousand, fifty-seven".