12021745 has 4 divisors (see below), whose sum is σ = 14426100. Its totient is φ = 9617392.

The previous prime is 12021701. The next prime is 12021749. The reversal of 12021745 is 54712021.

It is a happy number.

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 9345249 + 2676496 = 3057^2 + 1636^2 .

It is a cyclic number.

It is not a de Polignac number, because 12021745 - 2¹³ = 12013553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12021749) 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, 1202170 + ... + 1202179.

It is an arithmetic number, because the mean of its divisors is an integer number (3606525).

Almost surely, 2^12021745 is an apocalyptic number.

It is an amenable number.

12021745 is a deficient number, since it is larger than the sum of its proper divisors (2404355).

12021745 is an equidigital number, since it uses as much as digits as its factorization.

12021745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2404354.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 12021745 is about 3467.2388149650. The cubic root of 12021745 is about 229.0810529050.

Adding to 12021745 its reverse (54712021), we get a palindrome (66733766).

The spelling of 12021745 in words is "twelve million, twenty-one thousand, seven hundred forty-five".