12111972838 has 16 divisors (see below), whose sum is σ = 21073284864. Its totient is φ = 5113369800.

The previous prime is 12111972827. The next prime is 12111972839. The reversal of 12111972838 is 83827911121.

It is a junction number, because it is equal to n+sod(n) for n = 12111972794 and 12111972803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12111972839) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6455338 + ... + 6457213.

It is an arithmetic number, because the mean of its divisors is an integer number (1317080304).

Almost surely, 2^12111972838 is an apocalyptic number.

12111972838 is a deficient number, since it is larger than the sum of its proper divisors (8961312026).

12111972838 is a wasteful number, since it uses less digits than its factorization.

12111972838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12912627.

The product of its digits is 48384, while the sum is 43.

The spelling of 12111972838 in words is "twelve billion, one hundred eleven million, nine hundred seventy-two thousand, eight hundred thirty-eight".