116511221 has 4 divisors (see below), whose sum is σ = 116582700. Its totient is φ = 116439744.

The previous prime is 116511203. The next prime is 116511223. The reversal of 116511221 is 122115611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122115611 = 839 ⋅145549.

It can be written as a sum of positive squares in 2 ways, for example, as 84180625 + 32330596 = 9175^2 + 5686^2 .

It is a cyclic number.

It is not a de Polignac number, because 116511221 - 2¹⁴ = 116494837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 116511193 and 116511202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (116511223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33236 + ... + 36573.

It is an arithmetic number, because the mean of its divisors is an integer number (29145675).

Almost surely, 2^116511221 is an apocalyptic number.

It is an amenable number.

116511221 is a deficient number, since it is larger than the sum of its proper divisors (71479).

116511221 is an equidigital number, since it uses as much as digits as its factorization.

116511221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71478.

The product of its digits is 120, while the sum is 20.

The square root of 116511221 is about 10794.0363627329. The cubic root of 116511221 is about 488.4152899625.

Adding to 116511221 its reverse (122115611), we get a palindrome (238626832).

The spelling of 116511221 in words is "one hundred sixteen million, five hundred eleven thousand, two hundred twenty-one".