111012030021281 has 2 divisors, whose sum is σ = 111012030021282. Its totient is φ = 111012030021280.

The previous prime is 111012030021259. The next prime is 111012030021397. The reversal of 111012030021281 is 182120030210111.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83117956779025 + 27894073242256 = 9116905^2 + 5281484^2 .

It is a cyclic number.

It is not a de Polignac number, because 111012030021281 - 2¹⁰ = 111012030020257 is a prime.

It is a super-2 number, since 2×111012030021281² (a number of 29 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (111012030021251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55506015010640 + 55506015010641.

It is an arithmetic number, because the mean of its divisors is an integer number (55506015010641).

Almost surely, 2^{111012030021281} is an apocalyptic number.

It is an amenable number.

111012030021281 is a deficient number, since it is larger than the sum of its proper divisors (1).

111012030021281 is an equidigital number, since it uses as much as digits as its factorization.

111012030021281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 23.

Adding to 111012030021281 its reverse (182120030210111), we get a palindrome (293132060231392).

The spelling of 111012030021281 in words is "one hundred eleven trillion, twelve billion, thirty million, twenty-one thousand, two hundred eighty-one".