420168321 has 6 divisors (see below), whose sum is σ = 606909810. Its totient is φ = 280112208.

The previous prime is 420168313. The next prime is 420168367. The reversal of 420168321 is 123861024.

It can be written as a sum of positive squares in only one way, i.e., 328008321 + 92160000 = 18111^2 + 9600^2 .

It is not a de Polignac number, because 420168321 - 2³ = 420168313 is a prime.

It is a super-3 number, since 3×420168321³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (420168121) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23342676 + ... + 23342693.

It is an arithmetic number, because the mean of its divisors is an integer number (101151635).

Almost surely, 2^420168321 is an apocalyptic number.

It is an amenable number.

420168321 is a deficient number, since it is larger than the sum of its proper divisors (186741489).

420168321 is a wasteful number, since it uses less digits than its factorization.

420168321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46685375 (or 46685372 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 420168321 is about 20498.0077324602. The cubic root of 420168321 is about 748.9872677801.

The spelling of 420168321 in words is "four hundred twenty million, one hundred sixty-eight thousand, three hundred twenty-one".