12148521421 has 4 divisors (see below), whose sum is σ = 12152464992. Its totient is φ = 12144577852.

The previous prime is 12148521403. The next prime is 12148521461. The reversal of 12148521421 is 12412584121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12148521421 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 (12148521461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1967161 + ... + 1973326.

It is an arithmetic number, because the mean of its divisors is an integer number (3038116248).

Almost surely, 2^12148521421 is an apocalyptic number.

It is an amenable number.

12148521421 is a deficient number, since it is larger than the sum of its proper divisors (3943571).

12148521421 is an equidigital number, since it uses as much as digits as its factorization.

12148521421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3943570.

The product of its digits is 5120, while the sum is 31.

The spelling of 12148521421 in words is "twelve billion, one hundred forty-eight million, five hundred twenty-one thousand, four hundred twenty-one".