111132221281 has 2 divisors, whose sum is σ = 111132221282. Its totient is φ = 111132221280.

The previous prime is 111132221257. The next prime is 111132221311. The reversal of 111132221281 is 182122231111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69113781025 + 42018440256 = 262895^2 + 204984^2 .

It is a cyclic number.

It is not a de Polignac number, because 111132221281 - 2³¹ = 108984737633 is a prime.

It is a super-2 number, since 2×111132221281² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (111132221881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55566110640 + 55566110641.

It is an arithmetic number, because the mean of its divisors is an integer number (55566110641).

Almost surely, 2^111132221281 is an apocalyptic number.

It is an amenable number.

111132221281 is a deficient number, since it is larger than the sum of its proper divisors (1).

111132221281 is an equidigital number, since it uses as much as digits as its factorization.

111132221281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 384, while the sum is 25.

Adding to 111132221281 its reverse (182122231111), we get a palindrome (293254452392).

The spelling of 111132221281 in words is "one hundred eleven billion, one hundred thirty-two million, two hundred twenty-one thousand, two hundred eighty-one".