421333331 has 4 divisors (see below), whose sum is σ = 421890672. Its totient is φ = 420775992.

The previous prime is 421333327. The next prime is 421333349. The reversal of 421333331 is 133333124.

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

It is a cyclic number.

It is not a de Polignac number, because 421333331 - 2² = 421333327 is a prime.

It is a super-2 number, since 2×421333331² = 355043551623111122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 421333297 and 421333306.

It is not an unprimeable number, because it can be changed into a prime (421333361) 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 3 ways as a sum of consecutive naturals, for example, 277535 + ... + 279048.

It is an arithmetic number, because the mean of its divisors is an integer number (105472668).

Almost surely, 2^421333331 is an apocalyptic number.

421333331 is a deficient number, since it is larger than the sum of its proper divisors (557341).

421333331 is an equidigital number, since it uses as much as digits as its factorization.

421333331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557340.

The product of its digits is 1944, while the sum is 23.

The square root of 421333331 is about 20526.4057009502. The cubic root of 421333331 is about 749.6788734863.

Adding to 421333331 its reverse (133333124), we get a palindrome (554666455).

The spelling of 421333331 in words is "four hundred twenty-one million, three hundred thirty-three thousand, three hundred thirty-one".