420551321 has 16 divisors (see below), whose sum is σ = 455677200. Its totient is φ = 386684928.

The previous prime is 420551303. The next prime is 420551381. The reversal of 420551321 is 123155024.

It can be written as a sum of positive squares in 8 ways, for example, as 4840000 + 415711321 = 2200^2 + 20389^2 .

It is a cyclic number.

It is not a de Polignac number, because 420551321 - 2¹⁴ = 420534937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420551381) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 133715 + ... + 136823.

It is an arithmetic number, because the mean of its divisors is an integer number (28479825).

Almost surely, 2^420551321 is an apocalyptic number.

It is an amenable number.

420551321 is a deficient number, since it is larger than the sum of its proper divisors (35125879).

420551321 is a wasteful number, since it uses less digits than its factorization.

420551321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3308.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 420551321 is about 20507.3479757866. The cubic root of 420551321 is about 749.2147758138.

The spelling of 420551321 in words is "four hundred twenty million, five hundred fifty-one thousand, three hundred twenty-one".