421381073 has 4 divisors (see below), whose sum is σ = 421910580. Its totient is φ = 420851568.

The previous prime is 421381043. The next prime is 421381097. The reversal of 421381073 is 370183124.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 268042384 + 153338689 = 16372^2 + 12383^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421381073 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (421381003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 263558 + ... + 265151.

It is an arithmetic number, because the mean of its divisors is an integer number (105477645).

Almost surely, 2^421381073 is an apocalyptic number.

It is an amenable number.

421381073 is a deficient number, since it is larger than the sum of its proper divisors (529507).

421381073 is an equidigital number, since it uses as much as digits as its factorization.

421381073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 529506.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 421381073 is about 20527.5686090681. The cubic root of 421381073 is about 749.7071882151.

The spelling of 421381073 in words is "four hundred twenty-one million, three hundred eighty-one thousand, seventy-three".