12416661421 has 4 divisors (see below), whose sum is σ = 12421354912. Its totient is φ = 12411967932.

The previous prime is 12416661403. The next prime is 12416661437.

12416661421 is nontrivially palindromic in base 10.

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 not a de Polignac number, because 12416661421 - 2⁷ = 12416661293 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 (12416661461) 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, 2342775 + ... + 2348068.

It is an arithmetic number, because the mean of its divisors is an integer number (3105338728).

Almost surely, 2^12416661421 is an apocalyptic number.

It is an amenable number.

12416661421 is a deficient number, since it is larger than the sum of its proper divisors (4693491).

12416661421 is an equidigital number, since it uses as much as digits as its factorization.

12416661421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4693490.

The product of its digits is 13824, while the sum is 34.

The spelling of 12416661421 in words is "twelve billion, four hundred sixteen million, six hundred sixty-one thousand, four hundred twenty-one".