12021211 has 4 divisors (see below), whose sum is σ = 12409024. Its totient is φ = 11633400.

The previous prime is 12021187. The next prime is 12021259. The reversal of 12021211 is 11212021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11212021 = 419 ⋅26759.

It is a cyclic number.

It is not a de Polignac number, because 12021211 - 2⁵ = 12021179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12021311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 193860 + ... + 193921.

It is an arithmetic number, because the mean of its divisors is an integer number (3102256).

Almost surely, 2^12021211 is an apocalyptic number.

12021211 is a deficient number, since it is larger than the sum of its proper divisors (387813).

12021211 is an equidigital number, since it uses as much as digits as its factorization.

12021211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387812.

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

The square root of 12021211 is about 3467.1618075884. The cubic root of 12021211 is about 229.0776609655.

Adding to 12021211 its reverse (11212021), we get a palindrome (23233232).

The spelling of 12021211 in words is "twelve million, twenty-one thousand, two hundred eleven".