12447421879 has 16 divisors (see below), whose sum is σ = 13330548000. Its totient is φ = 11581553664.

The previous prime is 12447421867. The next prime is 12447421967. The reversal of 12447421879 is 97812474421.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 12447421879 - 2⁹ = 12447421367 is a prime.

It is a super-2 number, since 2×12447421879² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12447421849) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 839472 + ... + 854170.

It is an arithmetic number, because the mean of its divisors is an integer number (833159250).

Almost surely, 2^12447421879 is an apocalyptic number.

12447421879 is a deficient number, since it is larger than the sum of its proper divisors (883126121).

12447421879 is a wasteful number, since it uses less digits than its factorization.

12447421879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15282.

The product of its digits is 903168, while the sum is 49.

The spelling of 12447421879 in words is "twelve billion, four hundred forty-seven million, four hundred twenty-one thousand, eight hundred seventy-nine".