402304021 has 4 divisors (see below), whose sum is σ = 459776032. Its totient is φ = 344832012.

The previous prime is 402304003. The next prime is 402304051. The reversal of 402304021 is 120403204.

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 not a de Polignac number, because 402304021 - 2⁷ = 402303893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 402303986 and 402304004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402304051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28735995 + ... + 28736008.

It is an arithmetic number, because the mean of its divisors is an integer number (114944008).

Almost surely, 2^402304021 is an apocalyptic number.

It is an amenable number.

402304021 is a deficient number, since it is larger than the sum of its proper divisors (57472011).

402304021 is an equidigital number, since it uses as much as digits as its factorization.

402304021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57472010.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 402304021 is about 20057.5178175167. The cubic root of 402304021 is about 738.2182731641.

Adding to 402304021 its reverse (120403204), we get a palindrome (522707225).

The spelling of 402304021 in words is "four hundred two million, three hundred four thousand, twenty-one".