12053423021 has 4 divisors (see below), whose sum is σ = 12177685212. Its totient is φ = 11929160832.

The previous prime is 12053423003. The next prime is 12053423027. The reversal of 12053423021 is 12032435021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12032435021 = 73 ⋅164827877.

It can be written as a sum of positive squares in 2 ways, for example, as 6953892100 + 5099530921 = 83390^2 + 71411^2 .

It is a cyclic number.

It is not a de Polignac number, because 12053423021 - 2¹⁸ = 12053160877 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 (12053423027) 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, 62130950 + ... + 62131143.

It is an arithmetic number, because the mean of its divisors is an integer number (3044421303).

Almost surely, 2^12053423021 is an apocalyptic number.

It is an amenable number.

12053423021 is a deficient number, since it is larger than the sum of its proper divisors (124262191).

12053423021 is an equidigital number, since it uses as much as digits as its factorization.

12053423021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124262190.

The product of its (nonzero) digits is 1440, while the sum is 23.

Adding to 12053423021 its reverse (12032435021), we get a palindrome (24085858042).

The spelling of 12053423021 in words is "twelve billion, fifty-three million, four hundred twenty-three thousand, twenty-one".