12240023021 has 4 divisors (see below), whose sum is σ = 12570834492. Its totient is φ = 11909211552.

The previous prime is 12240022997. The next prime is 12240023051. The reversal of 12240023021 is 12032004221.

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 6123062500 + 6116960521 = 78250^2 + 78211^2 .

It is a cyclic number.

It is not a de Polignac number, because 12240023021 - 2¹⁴ = 12240006637 is a prime.

It is a super-3 number, since 3×12240023021³ (a number of 31 digits) contains 333 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 (12240023051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 165405680 + ... + 165405753.

It is an arithmetic number, because the mean of its divisors is an integer number (3142708623).

Almost surely, 2^12240023021 is an apocalyptic number.

It is an amenable number.

12240023021 is a deficient number, since it is larger than the sum of its proper divisors (330811471).

12240023021 is an equidigital number, since it uses as much as digits as its factorization.

12240023021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330811470.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 12240023021 its reverse (12032004221), we get a palindrome (24272027242).

The spelling of 12240023021 in words is "twelve billion, two hundred forty million, twenty-three thousand, twenty-one".