212001012173 has 2 divisors, whose sum is σ = 212001012174. Its totient is φ = 212001012172.

The previous prime is 212001012161. The next prime is 212001012187. The reversal of 212001012173 is 371210100212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 200850074569 + 11150937604 = 448163^2 + 105598^2 .

It is a cyclic number.

It is not a de Polignac number, because 212001012173 - 2⁶ = 212001012109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212001012143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106000506086 + 106000506087.

It is an arithmetic number, because the mean of its divisors is an integer number (106000506087).

Almost surely, 2^212001012173 is an apocalyptic number.

It is an amenable number.

212001012173 is a deficient number, since it is larger than the sum of its proper divisors (1).

212001012173 is an equidigital number, since it uses as much as digits as its factorization.

212001012173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168, while the sum is 20.

Adding to 212001012173 its reverse (371210100212), we get a palindrome (583211112385).

The spelling of 212001012173 in words is "two hundred twelve billion, one million, twelve thousand, one hundred seventy-three".