402212171 has 2 divisors, whose sum is σ = 402212172. Its totient is φ = 402212170.

The previous prime is 402212143. The next prime is 402212179. The reversal of 402212171 is 171212204.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 402212171 - 2¹⁸ = 401950027 is a prime.

It is not a weakly prime, because it can be changed into another prime (402212179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201106085 + 201106086.

It is an arithmetic number, because the mean of its divisors is an integer number (201106086).

Almost surely, 2^402212171 is an apocalyptic number.

402212171 is a deficient number, since it is larger than the sum of its proper divisors (1).

402212171 is an equidigital number, since it uses as much as digits as its factorization.

402212171 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 20.

The square root of 402212171 is about 20055.2280216406. The cubic root of 402212171 is about 738.1620880357.

Adding to 402212171 its reverse (171212204), we get a palindrome (573424375).

The spelling of 402212171 in words is "four hundred two million, two hundred twelve thousand, one hundred seventy-one".