12105204947 has 4 divisors (see below), whose sum is σ = 13205678136. Its totient is φ = 11004731760.

The previous prime is 12105204889. The next prime is 12105204961. The reversal of 12105204947 is 74940250121.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-12105204947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12105204047) 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, 550236578 + ... + 550236599.

It is an arithmetic number, because the mean of its divisors is an integer number (3301419534).

Almost surely, 2^12105204947 is an apocalyptic number.

12105204947 is a deficient number, since it is larger than the sum of its proper divisors (1100473189).

12105204947 is a wasteful number, since it uses less digits than its factorization.

12105204947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1100473188.

The product of its (nonzero) digits is 20160, while the sum is 35.

The spelling of 12105204947 in words is "twelve billion, one hundred five million, two hundred four thousand, nine hundred forty-seven".