2111201123557 has 2 divisors, whose sum is σ = 2111201123558. Its totient is φ = 2111201123556.

The previous prime is 2111201123429. The next prime is 2111201123611. The reversal of 2111201123557 is 7553211021112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1200720659076 + 910480464481 = 1095774^2 + 954191^2 .

It is a cyclic number.

It is not a de Polignac number, because 2111201123557 - 2⁷ = 2111201123429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2111201123357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1055600561778 + 1055600561779.

It is an arithmetic number, because the mean of its divisors is an integer number (1055600561779).

Almost surely, 2^{2111201123557} is an apocalyptic number.

It is an amenable number.

2111201123557 is a deficient number, since it is larger than the sum of its proper divisors (1).

2111201123557 is an equidigital number, since it uses as much as digits as its factorization.

2111201123557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4200, while the sum is 31.

Adding to 2111201123557 its reverse (7553211021112), we get a palindrome (9664412144669).

The spelling of 2111201123557 in words is "two trillion, one hundred eleven billion, two hundred one million, one hundred twenty-three thousand, five hundred fifty-seven".