12021161 has 4 divisors (see below), whose sum is σ = 12093312. Its totient is φ = 11949012.

The previous prime is 12021131. The next prime is 12021179. The reversal of 12021161 is 16112021.

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 12021161 - 2¹⁰ = 12020137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12021131) 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, 35825 + ... + 36158.

It is an arithmetic number, because the mean of its divisors is an integer number (3023328).

Almost surely, 2^12021161 is an apocalyptic number.

It is an amenable number.

12021161 is a deficient number, since it is larger than the sum of its proper divisors (72151).

12021161 is an equidigital number, since it uses as much as digits as its factorization.

12021161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72150.

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 12021161 is about 3467.1545970724. The cubic root of 12021161 is about 229.0773433631.

Adding to 12021161 its reverse (16112021), we get a palindrome (28133182).

The spelling of 12021161 in words is "twelve million, twenty-one thousand, one hundred sixty-one".