11512216716121 has 4 divisors (see below), whose sum is σ = 12558781872144. Its totient is φ = 10465651560100.

The previous prime is 11512216716067. The next prime is 11512216716137. The reversal of 11512216716121 is 12161761221511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 11512216716121 - 2⁴¹ = 9313193460569 is a prime.

It is a super-2 number, since 2×11512216716121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11512216716151) 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, 523282577995 + ... + 523282578016.

It is an arithmetic number, because the mean of its divisors is an integer number (3139695468036).

Almost surely, 2^{11512216716121} is an apocalyptic number.

11512216716121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11512216716121 is a deficient number, since it is larger than the sum of its proper divisors (1046565156023).

11512216716121 is a wasteful number, since it uses less digits than its factorization.

11512216716121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1046565156022.

The product of its digits is 10080, while the sum is 37.

Adding to 11512216716121 its reverse (12161761221511), we get a palindrome (23673977937632).

The spelling of 11512216716121 in words is "eleven trillion, five hundred twelve billion, two hundred sixteen million, seven hundred sixteen thousand, one hundred twenty-one".