111211202111281 has 2 divisors, whose sum is σ = 111211202111282. Its totient is φ = 111211202111280.

The previous prime is 111211202111279. The next prime is 111211202111293. The reversal of 111211202111281 is 182111202112111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68990317093681 + 42220885017600 = 8306041^2 + 6497760^2 .

It is a cyclic number.

It is not a de Polignac number, because 111211202111281 - 2¹ = 111211202111279 is a prime.

It is a super-2 number, since 2×111211202111281² (a number of 29 digits) contains 22 as substring.

Together with 111211202111279, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (111211202711281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55605601055640 + 55605601055641.

It is an arithmetic number, because the mean of its divisors is an integer number (55605601055641).

Almost surely, 2^{111211202111281} is an apocalyptic number.

It is an amenable number.

111211202111281 is a deficient number, since it is larger than the sum of its proper divisors (1).

111211202111281 is an equidigital number, since it uses as much as digits as its factorization.

111211202111281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 25.

Adding to 111211202111281 its reverse (182111202112111), we get a palindrome (293322404223392).

The spelling of 111211202111281 in words is "one hundred eleven trillion, two hundred eleven billion, two hundred two million, one hundred eleven thousand, two hundred eighty-one".