2111205557 has 2 divisors, whose sum is σ = 2111205558. Its totient is φ = 2111205556.

The previous prime is 2111205553. The next prime is 2111205583. The reversal of 2111205557 is 7555021112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1872379441 + 238826116 = 43271^2 + 15454^2 .

It is a cyclic number.

It is not a de Polignac number, because 2111205557 - 2² = 2111205553 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2111205553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1055602778 + 1055602779.

It is an arithmetic number, because the mean of its divisors is an integer number (1055602779).

Almost surely, 2^2111205557 is an apocalyptic number.

It is an amenable number.

2111205557 is a deficient number, since it is larger than the sum of its proper divisors (1).

2111205557 is an equidigital number, since it uses as much as digits as its factorization.

2111205557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3500, while the sum is 29.

The square root of 2111205557 is about 45947.8569358790. The cubic root of 2111205557 is about 1282.8528404093.

Adding to 2111205557 its reverse (7555021112), we get a palindrome (9666226669).

The spelling of 2111205557 in words is "two billion, one hundred eleven million, two hundred five thousand, five hundred fifty-seven".