212120001217 has 2 divisors, whose sum is σ = 212120001218. Its totient is φ = 212120001216.

The previous prime is 212120001179. The next prime is 212120001239. The reversal of 212120001217 is 712100021212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 169553709361 + 42566291856 = 411769^2 + 206316^2 .

It is a cyclic number.

It is not a de Polignac number, because 212120001217 - 2³¹ = 209972517569 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212120001194 and 212120001203.

It is not a weakly prime, because it can be changed into another prime (212120001617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106060000608 + 106060000609.

It is an arithmetic number, because the mean of its divisors is an integer number (106060000609).

Almost surely, 2^212120001217 is an apocalyptic number.

It is an amenable number.

212120001217 is a deficient number, since it is larger than the sum of its proper divisors (1).

212120001217 is an equidigital number, since it uses as much as digits as its factorization.

212120001217 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 19.

Adding to 212120001217 its reverse (712100021212), we get a palindrome (924220022429).

The spelling of 212120001217 in words is "two hundred twelve billion, one hundred twenty million, one thousand, two hundred seventeen".