1304300021 has 4 divisors (see below), whose sum is σ = 1316963232. Its totient is φ = 1291636812.

The previous prime is 1304299991. The next prime is 1304300029. The reversal of 1304300021 is 1200034031.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1200034031 = 7 ⋅171433433.

It is a cyclic number.

It is not a de Polignac number, because 1304300021 - 2²² = 1300105717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1304299969 and 1304300005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1304300029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6331451 + ... + 6331656.

It is an arithmetic number, because the mean of its divisors is an integer number (329240808).

Almost surely, 2^1304300021 is an apocalyptic number.

It is an amenable number.

1304300021 is a deficient number, since it is larger than the sum of its proper divisors (12663211).

1304300021 is a wasteful number, since it uses less digits than its factorization.

1304300021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12663210.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 1304300021 is about 36115.0940882064. The cubic root of 1304300021 is about 1092.5948952231.

Adding to 1304300021 its reverse (1200034031), we get a palindrome (2504334052).

The spelling of 1304300021 in words is "one billion, three hundred four million, three hundred thousand, twenty-one".