12132144421 has 4 divisors (see below), whose sum is σ = 12132738700. Its totient is φ = 12131550144.

The previous prime is 12132144413. The next prime is 12132144439. The reversal of 12132144421 is 12444123121.

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 11559260196 + 572884225 = 107514^2 + 23935^2 .

It is a cyclic number.

It is not a de Polignac number, because 12132144421 - 2³ = 12132144413 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 (12132144481) 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, 265386 + ... + 307723.

It is an arithmetic number, because the mean of its divisors is an integer number (3033184675).

Almost surely, 2^12132144421 is an apocalyptic number.

It is an amenable number.

12132144421 is a deficient number, since it is larger than the sum of its proper divisors (594279).

12132144421 is an equidigital number, since it uses as much as digits as its factorization.

12132144421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 594278.

The product of its digits is 1536, while the sum is 25.

Adding to 12132144421 its reverse (12444123121), we get a palindrome (24576267542).

The spelling of 12132144421 in words is "twelve billion, one hundred thirty-two million, one hundred forty-four thousand, four hundred twenty-one".