1211100116138 has 16 divisors (see below), whose sum is σ = 1993255688736. Its totient is φ = 547317969840.

The previous prime is 1211100116137. The next prime is 1211100116141. The reversal of 1211100116138 is 8316110011121.

It is not an unprimeable number, because it can be changed into a prime (1211100116137) 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, 159100256 + ... + 159107867.

It is an arithmetic number, because the mean of its divisors is an integer number (124578480546).

Almost surely, 2^{1211100116138} is an apocalyptic number.

1211100116138 is a deficient number, since it is larger than the sum of its proper divisors (782155572598).

1211100116138 is a wasteful number, since it uses less digits than its factorization.

1211100116138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318208309.

The product of its (nonzero) digits is 288, while the sum is 26.

Adding to 1211100116138 its reverse (8316110011121), we get a palindrome (9527210127259).

The spelling of 1211100116138 in words is "one trillion, two hundred eleven billion, one hundred million, one hundred sixteen thousand, one hundred thirty-eight".