212001221012171 has 2 divisors, whose sum is σ = 212001221012172. Its totient is φ = 212001221012170.

The previous prime is 212001221012149. The next prime is 212001221012201. The reversal of 212001221012171 is 171210122100212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 212001221012171 - 2⁶ = 212001221012107 is a prime.

It is not a weakly prime, because it can be changed into another prime (212001221012131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106000610506085 + 106000610506086.

It is an arithmetic number, because the mean of its divisors is an integer number (106000610506086).

Almost surely, 2^{212001221012171} is an apocalyptic number.

212001221012171 is a deficient number, since it is larger than the sum of its proper divisors (1).

212001221012171 is an equidigital number, since it uses as much as digits as its factorization.

212001221012171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 224, while the sum is 23.

Adding to 212001221012171 its reverse (171210122100212), we get a palindrome (383211343112383).

The spelling of 212001221012171 in words is "two hundred twelve trillion, one billion, two hundred twenty-one million, twelve thousand, one hundred seventy-one".