12021121 has 16 divisors (see below), whose sum is σ = 14198400. Its totient is φ = 10172400.

The previous prime is 12021071. The next prime is 12021131. The reversal of 12021121 is 12112021.

It is not a de Polignac number, because 12021121 - 2⁹ = 12020609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12021098 and 12021107.

It is not an unprimeable number, because it can be changed into a prime (12021131) 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, 34470 + ... + 34816.

It is an arithmetic number, because the mean of its divisors is an integer number (887400).

Almost surely, 2^12021121 is an apocalyptic number.

It is an amenable number.

12021121 is a deficient number, since it is larger than the sum of its proper divisors (2177279).

12021121 is an equidigital number, since it uses as much as digits as its factorization.

12021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469 (or 455 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 12021121 is about 3467.1488286487. The cubic root of 12021121 is about 229.0770892804.

Adding to 12021121 its reverse (12112021), we get a palindrome (24133142).

It can be divided in two parts, 12021 and 121, that multiplied together give a palindrome (1454541).

The spelling of 12021121 in words is "twelve million, twenty-one thousand, one hundred twenty-one".