12021331 has 16 divisors (see below), whose sum is σ = 14284800. Its totient is φ = 9902880.

The previous prime is 12021311. The next prime is 12021353. The reversal of 12021331 is 13312021.

It is a cyclic number.

It is not a de Polignac number, because 12021331 - 2⁵ = 12021299 is a prime.

It is a super-2 number, since 2×12021331² = 289024798023122, which contains 22 as substring.

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 polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19770 + ... + 20368.

It is an arithmetic number, because the mean of its divisors is an integer number (892800).

Almost surely, 2^12021331 is an apocalyptic number.

12021331 is a deficient number, since it is larger than the sum of its proper divisors (2263469).

12021331 is an equidigital number, since it uses as much as digits as its factorization.

12021331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 714.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 12021331 is about 3467.1791127659. The cubic root of 12021331 is about 229.0784232079.

Adding to 12021331 its reverse (13312021), we get a palindrome (25333352).

The spelling of 12021331 in words is "twelve million, twenty-one thousand, three hundred thirty-one".