12111972847 has 16 divisors (see below), whose sum is σ = 13814956512. Its totient is φ = 10519557120.

The previous prime is 12111972839. The next prime is 12111972863. The reversal of 12111972847 is 74827911121.

It is a cyclic number.

It is not a de Polignac number, because 12111972847 - 2³ = 12111972839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12111972827) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1101963 + ... + 1112899.

It is an arithmetic number, because the mean of its divisors is an integer number (863434782).

Almost surely, 2^12111972847 is an apocalyptic number.

12111972847 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

12111972847 is a deficient number, since it is larger than the sum of its proper divisors (1702983665).

12111972847 is a wasteful number, since it uses less digits than its factorization.

12111972847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15978.

The product of its digits is 56448, while the sum is 43.

The spelling of 12111972847 in words is "twelve billion, one hundred eleven million, nine hundred seventy-two thousand, eight hundred forty-seven".