21112212000181 has 2 divisors, whose sum is σ = 21112212000182. Its totient is φ = 21112212000180.

The previous prime is 21112212000169. The next prime is 21112212000221. The reversal of 21112212000181 is 18100021221112.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19793467530225 + 1318744469956 = 4448985^2 + 1148366^2 .

It is a cyclic number.

It is not a de Polignac number, because 21112212000181 - 2⁷ = 21112212000053 is a prime.

It is a super-2 number, since 2×21112212000181² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21112212000151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556106000090 + 10556106000091.

It is an arithmetic number, because the mean of its divisors is an integer number (10556106000091).

Almost surely, 2^{21112212000181} is an apocalyptic number.

It is an amenable number.

21112212000181 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112212000181 is an equidigital number, since it uses as much as digits as its factorization.

21112212000181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 22.

Adding to 21112212000181 its reverse (18100021221112), we get a palindrome (39212233221293).

The spelling of 21112212000181 in words is "twenty-one trillion, one hundred twelve billion, two hundred twelve million, one hundred eighty-one", and thus it is an aban number.