113221520281 has 4 divisors (see below), whose sum is σ = 113274404964. Its totient is φ = 113168635600.

The previous prime is 113221520233. The next prime is 113221520309. The reversal of 113221520281 is 182025122311.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 107967445056 + 5254075225 = 328584^2 + 72485^2 .

It is a cyclic number.

It is not a de Polignac number, because 113221520281 - 2²¹ = 113219423129 is a prime.

It is a super-2 number, since 2×113221520281² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (113221520221) 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 in 3 ways as a sum of consecutive naturals, for example, 26439130 + ... + 26443411.

It is an arithmetic number, because the mean of its divisors is an integer number (28318601241).

Almost surely, 2^113221520281 is an apocalyptic number.

It is an amenable number.

113221520281 is a deficient number, since it is larger than the sum of its proper divisors (52884683).

113221520281 is an equidigital number, since it uses as much as digits as its factorization.

113221520281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52884682.

The product of its (nonzero) digits is 1920, while the sum is 28.

Adding to 113221520281 its reverse (182025122311), we get a palindrome (295246642592).

The spelling of 113221520281 in words is "one hundred thirteen billion, two hundred twenty-one million, five hundred twenty thousand, two hundred eighty-one".