12921345629 has 4 divisors (see below), whose sum is σ = 13077024576. Its totient is φ = 12765666684.

The previous prime is 12921345581. The next prime is 12921345643. The reversal of 12921345629 is 92654312921.

It is a happy number.

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 12921345629 - 2³² = 8626378333 is a prime.

It is a super-2 number, since 2×12921345629² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12921345629.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12921345649) 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, 77839349 + ... + 77839514.

It is an arithmetic number, because the mean of its divisors is an integer number (3269256144).

Almost surely, 2^12921345629 is an apocalyptic number.

It is an amenable number.

12921345629 is a deficient number, since it is larger than the sum of its proper divisors (155678947).

12921345629 is an equidigital number, since it uses as much as digits as its factorization.

12921345629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155678946.

The product of its digits is 233280, while the sum is 44.

The spelling of 12921345629 in words is "twelve billion, nine hundred twenty-one million, three hundred forty-five thousand, six hundred twenty-nine".