421331305 has 4 divisors (see below), whose sum is σ = 505597572. Its totient is φ = 337065040.

The previous prime is 421331303. The next prime is 421331311. The reversal of 421331305 is 503133124.

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 54110736 + 367220569 = 7356^2 + 19163^2 .

It is not a de Polignac number, because 421331305 - 2¹ = 421331303 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421331303) 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, 42133126 + ... + 42133135.

It is an arithmetic number, because the mean of its divisors is an integer number (126399393).

Almost surely, 2^421331305 is an apocalyptic number.

It is an amenable number.

421331305 is a deficient number, since it is larger than the sum of its proper divisors (84266267).

421331305 is an equidigital number, since it uses as much as digits as its factorization.

421331305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84266266.

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 421331305 is about 20526.3563498250. The cubic root of 421331305 is about 749.6776718630.

Adding to 421331305 its reverse (503133124), we get a palindrome (924464429).

The spelling of 421331305 in words is "four hundred twenty-one million, three hundred thirty-one thousand, three hundred five".