111100212012161 has 2 divisors, whose sum is σ = 111100212012162. Its totient is φ = 111100212012160.

The previous prime is 111100212012113. The next prime is 111100212012211. The reversal of 111100212012161 is 161210212001111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73928510152561 + 37171701859600 = 8598169^2 + 6096860^2 .

It is a cyclic number.

It is not a de Polignac number, because 111100212012161 - 2²² = 111100207817857 is a prime.

It is not a weakly prime, because it can be changed into another prime (111100212012661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55550106006080 + 55550106006081.

It is an arithmetic number, because the mean of its divisors is an integer number (55550106006081).

Almost surely, 2^{111100212012161} is an apocalyptic number.

It is an amenable number.

111100212012161 is a deficient number, since it is larger than the sum of its proper divisors (1).

111100212012161 is an equidigital number, since it uses as much as digits as its factorization.

111100212012161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 20.

Adding to 111100212012161 its reverse (161210212001111), we get a palindrome (272310424013272).

The spelling of 111100212012161 in words is "one hundred eleven trillion, one hundred billion, two hundred twelve million, twelve thousand, one hundred sixty-one".