421333328 has 20 divisors (see below), whose sum is σ = 879128628. Its totient is φ = 194461440.

The previous prime is 421333327. The next prime is 421333349. The reversal of 421333328 is 823333124.

It can be written as a sum of positive squares in 2 ways, for example, as 269353744 + 151979584 = 16412^2 + 12328^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 421333328.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421333327) 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 3 ways as a sum of consecutive naturals, for example, 1012613 + ... + 1013028.

Almost surely, 2^421333328 is an apocalyptic number.

It is an amenable number.

421333328 is an abundant number, since it is smaller than the sum of its proper divisors (457795300).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

421333328 is a wasteful number, since it uses less digits than its factorization.

421333328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2025662 (or 2025656 counting only the distinct ones).

The product of its digits is 10368, while the sum is 29.

The square root of 421333328 is about 20526.4056278736. The cubic root of 421333328 is about 749.6788717070.

The spelling of 421333328 in words is "four hundred twenty-one million, three hundred thirty-three thousand, three hundred twenty-eight".