108161221 has 4 divisors (see below), whose sum is σ = 123612832. Its totient is φ = 92709612.

The previous prime is 108161189. The next prime is 108161231. The reversal of 108161221 is 122161801.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 108161221 - 2⁵ = 108161189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 108161192 and 108161201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (108161231) 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 3 ways as a sum of consecutive naturals, for example, 7725795 + ... + 7725808.

It is an arithmetic number, because the mean of its divisors is an integer number (30903208).

Almost surely, 2^108161221 is an apocalyptic number.

It is an amenable number.

108161221 is a deficient number, since it is larger than the sum of its proper divisors (15451611).

108161221 is an equidigital number, since it uses as much as digits as its factorization.

108161221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15451610.

The product of its (nonzero) digits is 192, while the sum is 22.

The square root of 108161221 is about 10400.0587017574. The cubic root of 108161221 is about 476.4571629466.

The spelling of 108161221 in words is "one hundred eight million, one hundred sixty-one thousand, two hundred twenty-one".