211231330101217 has 2 divisors, whose sum is σ = 211231330101218. Its totient is φ = 211231330101216.

The previous prime is 211231330101157. The next prime is 211231330101257. The reversal of 211231330101217 is 712101033132112.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 182289125099601 + 28942205001616 = 13501449^2 + 5379796^2 .

It is a cyclic number.

It is not a de Polignac number, because 211231330101217 - 2²⁷ = 211231195883489 is a prime.

It is not a weakly prime, because it can be changed into another prime (211231330101257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105615665050608 + 105615665050609.

It is an arithmetic number, because the mean of its divisors is an integer number (105615665050609).

Almost surely, 2^{211231330101217} is an apocalyptic number.

It is an amenable number.

211231330101217 is a deficient number, since it is larger than the sum of its proper divisors (1).

211231330101217 is an equidigital number, since it uses as much as digits as its factorization.

211231330101217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 28.

Adding to 211231330101217 its reverse (712101033132112), we get a palindrome (923332363233329).

The spelling of 211231330101217 in words is "two hundred eleven trillion, two hundred thirty-one billion, three hundred thirty million, one hundred one thousand, two hundred seventeen".