10111212161 has 2 divisors, whose sum is σ = 10111212162. Its totient is φ = 10111212160.

The previous prime is 10111212127. The next prime is 10111212173. The reversal of 10111212161 is 16121211101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9606940225 + 504271936 = 98015^2 + 22456^2 .

It is an emirp because it is prime and its reverse (16121211101) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10111212161 is a prime.

It is a super-2 number, since 2×10111212161² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (10111212101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5055606080 + 5055606081.

It is an arithmetic number, because the mean of its divisors is an integer number (5055606081).

Almost surely, 2^10111212161 is an apocalyptic number.

It is an amenable number.

10111212161 is a deficient number, since it is larger than the sum of its proper divisors (1).

10111212161 is an equidigital number, since it uses as much as digits as its factorization.

10111212161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 17.

Adding to 10111212161 its reverse (16121211101), we get a palindrome (26232423262).

The spelling of 10111212161 in words is "ten billion, one hundred eleven million, two hundred twelve thousand, one hundred sixty-one".