12311021 has 4 divisors (see below), whose sum is σ = 12364092. Its totient is φ = 12257952.

The previous prime is 12311017. The next prime is 12311023. The reversal of 12311021 is 12011321.

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

It can be written as a sum of positive squares in 2 ways, for example, as 784996 + 11526025 = 886^2 + 3395^2 .

It is a cyclic number.

It is not a de Polignac number, because 12311021 - 2² = 12311017 is a prime.

It is a super-2 number, since 2×12311021² = 303122476124882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12310993 and 12311011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12311023) 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, 26186 + ... + 26651.

It is an arithmetic number, because the mean of its divisors is an integer number (3091023).

Almost surely, 2^12311021 is an apocalyptic number.

It is an amenable number.

12311021 is a deficient number, since it is larger than the sum of its proper divisors (53071).

12311021 is an equidigital number, since it uses as much as digits as its factorization.

12311021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53070.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 12311021 is about 3508.7064568014. The cubic root of 12311021 is about 230.9039473723.

Adding to 12311021 its reverse (12011321), we get a palindrome (24322342).

The spelling of 12311021 in words is "twelve million, three hundred eleven thousand, twenty-one".