12129719894 has 8 divisors (see below), whose sum is σ = 18261719328. Its totient is φ = 6042480120.

The previous prime is 12129719893. The next prime is 12129719939. The reversal of 12129719894 is 49891792121.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12129719893) 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, 11189237 + ... + 11190320.

It is an arithmetic number, because the mean of its divisors is an integer number (2282714916).

Almost surely, 2^12129719894 is an apocalyptic number.

12129719894 is a deficient number, since it is larger than the sum of its proper divisors (6131999434).

12129719894 is a wasteful number, since it uses less digits than its factorization.

12129719894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22379830.

The product of its digits is 653184, while the sum is 53.

The spelling of 12129719894 in words is "twelve billion, one hundred twenty-nine million, seven hundred nineteen thousand, eight hundred ninety-four".