12102978947 has 4 divisors (see below), whose sum is σ = 12169846416. Its totient is φ = 12036111480.

The previous prime is 12102978917. The next prime is 12102978973. The reversal of 12102978947 is 74987920121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74987920121 = 29 ⋅2585790349.

It is a cyclic number.

It is not a de Polignac number, because 12102978947 - 2¹⁴ = 12102962563 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12102978895 and 12102978904.

It is not an unprimeable number, because it can be changed into a prime (12102978917) 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, 33433463 + ... + 33433824.

It is an arithmetic number, because the mean of its divisors is an integer number (3042461604).

Almost surely, 2^12102978947 is an apocalyptic number.

12102978947 is a deficient number, since it is larger than the sum of its proper divisors (66867469).

12102978947 is an equidigital number, since it uses as much as digits as its factorization.

12102978947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66867468.

The product of its (nonzero) digits is 508032, while the sum is 50.

The spelling of 12102978947 in words is "twelve billion, one hundred two million, nine hundred seventy-eight thousand, nine hundred forty-seven".