421212173 has 2 divisors, whose sum is σ = 421212174. Its totient is φ = 421212172.

The previous prime is 421212163. The next prime is 421212191. The reversal of 421212173 is 371212124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 347561449 + 73650724 = 18643^2 + 8582^2 .

It is a cyclic number.

It is not a de Polignac number, because 421212173 - 2²⁸ = 152776717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421212163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210606086 + 210606087.

It is an arithmetic number, because the mean of its divisors is an integer number (210606087).

Almost surely, 2^421212173 is an apocalyptic number.

It is an amenable number.

421212173 is a deficient number, since it is larger than the sum of its proper divisors (1).

421212173 is an equidigital number, since it uses as much as digits as its factorization.

421212173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 672, while the sum is 23.

The square root of 421212173 is about 20523.4542170659. The cubic root of 421212173 is about 749.6070077417.

Adding to 421212173 its reverse (371212124), we get a palindrome (792424297).

The spelling of 421212173 in words is "four hundred twenty-one million, two hundred twelve thousand, one hundred seventy-three".