11816773121 has 2 divisors, whose sum is σ = 11816773122. Its totient is φ = 11816773120.

The previous prime is 11816773109. The next prime is 11816773211. The reversal of 11816773121 is 12137761811.

Together with next prime (11816773211) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9014553025 + 2802220096 = 94945^2 + 52936^2 .

It is a cyclic number.

It is not a de Polignac number, because 11816773121 - 2¹⁴ = 11816756737 is a prime.

It is a super-2 number, since 2×11816773121² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11816773021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5908386560 + 5908386561.

It is an arithmetic number, because the mean of its divisors is an integer number (5908386561).

Almost surely, 2^11816773121 is an apocalyptic number.

It is an amenable number.

11816773121 is a deficient number, since it is larger than the sum of its proper divisors (1).

11816773121 is an equidigital number, since it uses as much as digits as its factorization.

11816773121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14112, while the sum is 38.

The spelling of 11816773121 in words is "eleven billion, eight hundred sixteen million, seven hundred seventy-three thousand, one hundred twenty-one".