1304210021 has 8 divisors (see below), whose sum is σ = 1348665600. Its totient is φ = 1259903520.

The previous prime is 1304209967. The next prime is 1304210057. The reversal of 1304210021 is 1200124031.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1304210021 - 2⁶ = 1304209957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1304209978 and 1304210005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1304210221) 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 7 ways as a sum of consecutive naturals, for example, 19331 + ... + 54608.

It is an arithmetic number, because the mean of its divisors is an integer number (168583200).

Almost surely, 2^1304210021 is an apocalyptic number.

It is an amenable number.

1304210021 is a deficient number, since it is larger than the sum of its proper divisors (44455579).

1304210021 is an equidigital number, since it uses as much as digits as its factorization.

1304210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74539.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 1304210021 is about 36113.8480502978. The cubic root of 1304210021 is about 1092.5697640414.

Adding to 1304210021 its reverse (1200124031), we get a palindrome (2504334052).

The spelling of 1304210021 in words is "one billion, three hundred four million, two hundred ten thousand, twenty-one".