421333291 has 4 divisors (see below), whose sum is σ = 422416800. Its totient is φ = 420249784.

The previous prime is 421333279. The next prime is 421333309. The reversal of 421333291 is 192333124.

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 421333291 - 2¹⁹ = 420809003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421333091) 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, 541171 + ... + 541948.

It is an arithmetic number, because the mean of its divisors is an integer number (105604200).

Almost surely, 2^421333291 is an apocalyptic number.

421333291 is a deficient number, since it is larger than the sum of its proper divisors (1083509).

421333291 is a wasteful number, since it uses less digits than its factorization.

421333291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1083508.

The product of its digits is 3888, while the sum is 28.

The square root of 421333291 is about 20526.4047265954. The cubic root of 421333291 is about 749.6788497623.

The spelling of 421333291 in words is "four hundred twenty-one million, three hundred thirty-three thousand, two hundred ninety-one".