116206821 has 6 divisors (see below), whose sum is σ = 167854310. Its totient is φ = 77471208.

The previous prime is 116206801. The next prime is 116206829. The reversal of 116206821 is 128602611.

116206821 is a `hidden beast` number, since 11 + 620 + 6 + 8 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 106378596 + 9828225 = 10314^2 + 3135^2 .

It is not a de Polignac number, because 116206821 - 2⁵ = 116206789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (116206829) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6455926 + ... + 6455943.

Almost surely, 2^116206821 is an apocalyptic number.

It is an amenable number.

116206821 is a deficient number, since it is larger than the sum of its proper divisors (51647489).

116206821 is a wasteful number, since it uses less digits than its factorization.

116206821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12911875 (or 12911872 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 116206821 is about 10779.9267622744. The cubic root of 116206821 is about 487.9895705130.

The spelling of 116206821 in words is "one hundred sixteen million, two hundred six thousand, eight hundred twenty-one".