1211100110257 has 2 divisors, whose sum is σ = 1211100110258. Its totient is φ = 1211100110256.

The previous prime is 1211100110183. The next prime is 1211100110279. The reversal of 1211100110257 is 7520110011121.

It is an a-pointer prime, because the next prime (1211100110279) can be obtained adding 1211100110257 to its sum of digits (22).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1175248959921 + 35851150336 = 1084089^2 + 189344^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211100110257 - 2²⁷ = 1210965892529 is a prime.

It is a super-3 number, since 3×1211100110257³ (a number of 37 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1211100110557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605550055128 + 605550055129.

It is an arithmetic number, because the mean of its divisors is an integer number (605550055129).

Almost surely, 2^{1211100110257} is an apocalyptic number.

It is an amenable number.

1211100110257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211100110257 is an equidigital number, since it uses as much as digits as its factorization.

1211100110257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 140, while the sum is 22.

Adding to 1211100110257 its reverse (7520110011121), we get a palindrome (8731210121378).

The spelling of 1211100110257 in words is "one trillion, two hundred eleven billion, one hundred million, one hundred ten thousand, two hundred fifty-seven".