170402021 has 2 divisors, whose sum is σ = 170402022. Its totient is φ = 170402020.

The previous prime is 170402003. The next prime is 170402069. The reversal of 170402021 is 120204071.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119793025 + 50608996 = 10945^2 + 7114^2 .

It is a cyclic number.

It is not a de Polignac number, because 170402021 - 2¹⁸ = 170139877 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (170402081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85201010 + 85201011.

It is an arithmetic number, because the mean of its divisors is an integer number (85201011).

Almost surely, 2^170402021 is an apocalyptic number.

It is an amenable number.

170402021 is a deficient number, since it is larger than the sum of its proper divisors (1).

170402021 is an equidigital number, since it uses as much as digits as its factorization.

170402021 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 17.

The square root of 170402021 is about 13053.8125082292. The cubic root of 170402021 is about 554.4021601297.

Adding to 170402021 its reverse (120204071), we get a palindrome (290606092).

The spelling of 170402021 in words is "one hundred seventy million, four hundred two thousand, twenty-one".