12021853 has 4 divisors (see below), whose sum is σ = 12157020. Its totient is φ = 11886688.

The previous prime is 12021817. The next prime is 12021857. The reversal of 12021853 is 35812021.

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 2424249 + 9597604 = 1557^2 + 3098^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12021853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021857) 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, 67450 + ... + 67627.

It is an arithmetic number, because the mean of its divisors is an integer number (3039255).

Almost surely, 2^12021853 is an apocalyptic number.

It is an amenable number.

12021853 is a deficient number, since it is larger than the sum of its proper divisors (135167).

12021853 is an equidigital number, since it uses as much as digits as its factorization.

12021853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135166.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 12021853 is about 3467.2543892827. The cubic root of 12021853 is about 229.0817389030.

Adding to 12021853 its reverse (35812021), we get a palindrome (47833874).

The spelling of 12021853 in words is "twelve million, twenty-one thousand, eight hundred fifty-three".