161021116 has 12 divisors (see below), whose sum is σ = 282545032. Its totient is φ = 80293968.

The previous prime is 161021071. The next prime is 161021117. The reversal of 161021116 is 611120161.

161021116 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 161021093 and 161021102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161021117) 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, 52470 + ... + 55453.

Almost surely, 2^161021116 is an apocalyptic number.

It is an amenable number.

161021116 is a deficient number, since it is larger than the sum of its proper divisors (121523916).

161021116 is a wasteful number, since it uses less digits than its factorization.

161021116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108300 (or 108298 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 161021116 is about 12689.4096001351. The cubic root of 161021116 is about 544.0359648584.

Adding to 161021116 its reverse (611120161), we get a palindrome (772141277).

The spelling of 161021116 in words is "one hundred sixty-one million, twenty-one thousand, one hundred sixteen".