211110021211217 has 2 divisors, whose sum is σ = 211110021211218. Its totient is φ = 211110021211216.

The previous prime is 211110021211213. The next prime is 211110021211253. The reversal of 211110021211217 is 712112120011112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 207390989957776 + 3719031253441 = 14401076^2 + 1928479^2 .

It is a cyclic number.

It is not a de Polignac number, because 211110021211217 - 2² = 211110021211213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211110021211192 and 211110021211201.

It is not a weakly prime, because it can be changed into another prime (211110021211213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105555010605608 + 105555010605609.

It is an arithmetic number, because the mean of its divisors is an integer number (105555010605609).

Almost surely, 2^{211110021211217} is an apocalyptic number.

It is an amenable number.

211110021211217 is a deficient number, since it is larger than the sum of its proper divisors (1).

211110021211217 is an equidigital number, since it uses as much as digits as its factorization.

211110021211217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 23.

Adding to 211110021211217 its reverse (712112120011112), we get a palindrome (923222141222329).

The spelling of 211110021211217 in words is "two hundred eleven trillion, one hundred ten billion, twenty-one million, two hundred eleven thousand, two hundred seventeen".