12921953449 has 8 divisors (see below), whose sum is σ = 13654460160. Its totient is φ = 12203670336.

The previous prime is 12921953437. The next prime is 12921953461. The reversal of 12921953449 is 94435912921.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (12921953437) and next prime (12921953461).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12921953449 - 2⁹ = 12921952937 is a prime.

It is a super-3 number, since 3×12921953449³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12921923449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3554032 + ... + 3557665.

It is an arithmetic number, because the mean of its divisors is an integer number (1706807520).

Almost surely, 2^12921953449 is an apocalyptic number.

It is an amenable number.

12921953449 is a deficient number, since it is larger than the sum of its proper divisors (732506711).

12921953449 is an equidigital number, since it uses as much as digits as its factorization.

12921953449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7111799.

The product of its digits is 699840, while the sum is 49.

The spelling of 12921953449 in words is "twelve billion, nine hundred twenty-one million, nine hundred fifty-three thousand, four hundred forty-nine".