12021231 has 4 divisors (see below), whose sum is σ = 16028312. Its totient is φ = 8014152.

The previous prime is 12021187. The next prime is 12021259. The reversal of 12021231 is 13212021.

12021231 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 12021231 - 2¹⁴ = 12004847 is a prime.

It is a super-2 number, since 2×12021231² = 289019989510722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent 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, 2003536 + ... + 2003541.

It is an arithmetic number, because the mean of its divisors is an integer number (4007078).

Almost surely, 2^12021231 is an apocalyptic number.

12021231 is a deficient number, since it is larger than the sum of its proper divisors (4007081).

12021231 is an equidigital number, since it uses as much as digits as its factorization.

12021231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4007080.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 12021231 is about 3467.1646917907. The cubic root of 12021231 is about 229.0777880063.

Adding to 12021231 its reverse (13212021), we get a palindrome (25233252).

The spelling of 12021231 in words is "twelve million, twenty-one thousand, two hundred thirty-one".