420665421 has 8 divisors (see below), whose sum is σ = 611877024. Its totient is φ = 254948720.

The previous prime is 420665419. The next prime is 420665447. The reversal of 420665421 is 124566024.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 420665421 - 2¹ = 420665419 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420665411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6373686 + ... + 6373751.

It is an arithmetic number, because the mean of its divisors is an integer number (76484628).

Almost surely, 2^420665421 is an apocalyptic number.

It is an amenable number.

420665421 is a deficient number, since it is larger than the sum of its proper divisors (191211603).

420665421 is a wasteful number, since it uses less digits than its factorization.

420665421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12747451.

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 420665421 is about 20510.1297168009. The cubic root of 420665421 is about 749.2825263053.

The spelling of 420665421 in words is "four hundred twenty million, six hundred sixty-five thousand, four hundred twenty-one".