421331331 has 16 divisors (see below), whose sum is σ = 580677120. Its totient is φ = 271593120.

The previous prime is 421331311. The next prime is 421331333. The reversal of 421331331 is 133133124.

It is not a de Polignac number, because 421331331 - 2⁵ = 421331299 is a prime.

It is a super-2 number, since 2×421331331² = 355040180964463122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 421331298 and 421331307.

It is not an unprimeable number, because it can be changed into a prime (421331333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8715 + ... + 30308.

It is an arithmetic number, because the mean of its divisors is an integer number (36292320).

Almost surely, 2^421331331 is an apocalyptic number.

421331331 is a deficient number, since it is larger than the sum of its proper divisors (159345789).

421331331 is a wasteful number, since it uses less digits than its factorization.

421331331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39146.

The product of its digits is 648, while the sum is 21.

The square root of 421331331 is about 20526.3569831570. The cubic root of 421331331 is about 749.6776872836.

Adding to 421331331 its reverse (133133124), we get a palindrome (554464455).

The spelling of 421331331 in words is "four hundred twenty-one million, three hundred thirty-one thousand, three hundred thirty-one".