334720821 has 4 divisors (see below), whose sum is σ = 446294432. Its totient is φ = 223147212.

The previous prime is 334720801. The next prime is 334720829. The reversal of 334720821 is 128027433.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-334720821 is a prime.

It is a super-2 number, since 2×334720821² = 224076056021828082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (334720829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55786801 + ... + 55786806.

It is an arithmetic number, because the mean of its divisors is an integer number (111573608).

Almost surely, 2^334720821 is an apocalyptic number.

It is an amenable number.

334720821 is a deficient number, since it is larger than the sum of its proper divisors (111573611).

334720821 is a wasteful number, since it uses less digits than its factorization.

334720821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111573610.

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 334720821 is about 18295.3770390227. The cubic root of 334720821 is about 694.3219728404.

The spelling of 334720821 in words is "three hundred thirty-four million, seven hundred twenty thousand, eight hundred twenty-one".