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116021 = 181641

116021 has 4 divisors (see below), whose sum is σ = 116844. Its totient is φ = 115200.

The previous prime is 116009. The next prime is 116027. The reversal of 116021 is 120611.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 120611 = 294159.

It can be written as a sum of positive squares in 2 ways, for example, as 45796 + 70225 = 214^2 + 265^2 .

It is a cyclic number.

It is not a de Polignac number, because 116021 - 210 = 114997 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 115993 and 116011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (116027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140 + ... + 501.

It is an arithmetic number, because the mean of its divisors is an integer number (29211).

2116021 is an apocalyptic number.

It is an amenable number.

116021 is a deficient number, since it is larger than the sum of its proper divisors (823).

116021 is an equidigital number, since it uses as much as digits as its factorization.

116021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 822.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 116021 is about 340.6185549849. The cubic root of 116021 is about 48.7729324498.

Adding to 116021 its reverse (120611), we get a palindrome (236632).

The spelling of 116021 in words is "one hundred sixteen thousand, twenty-one".

Divisors: 1 181 641 116021