161107221 has 16 divisors (see below), whose sum is σ = 236662848. Its totient is φ = 96672000.

The previous prime is 161107207. The next prime is 161107223. The reversal of 161107221 is 122701161.

It is a happy number.

It is not a de Polignac number, because 161107221 - 2⁵ = 161107189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161107223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20836 + ... + 27501.

It is an arithmetic number, because the mean of its divisors is an integer number (14791428).

Almost surely, 2^161107221 is an apocalyptic number.

161107221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

161107221 is a deficient number, since it is larger than the sum of its proper divisors (75555627).

161107221 is a wasteful number, since it uses less digits than its factorization.

161107221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48452.

The product of its (nonzero) digits is 168, while the sum is 21.

The square root of 161107221 is about 12692.8019365308. The cubic root of 161107221 is about 544.1329208157.

Adding to 161107221 its reverse (122701161), we get a palindrome (283808382).

The spelling of 161107221 in words is "one hundred sixty-one million, one hundred seven thousand, two hundred twenty-one".