1304241221 has 4 divisors (see below), whose sum is σ = 1305634092. Its totient is φ = 1302848352.

The previous prime is 1304241217. The next prime is 1304241277. The reversal of 1304241221 is 1221424031.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 102232321 + 1202008900 = 10111^2 + 34670^2 .

It is a cyclic number.

It is not a de Polignac number, because 1304241221 - 2² = 1304241217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1304241193 and 1304241202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1304241121) 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, 695030 + ... + 696903.

It is an arithmetic number, because the mean of its divisors is an integer number (326408523).

Almost surely, 2^1304241221 is an apocalyptic number.

It is an amenable number.

1304241221 is a deficient number, since it is larger than the sum of its proper divisors (1392871).

1304241221 is an equidigital number, since it uses as much as digits as its factorization.

1304241221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1392870.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1304241221 is about 36114.2800149747. The cubic root of 1304241221 is about 1092.5784763153.

Adding to 1304241221 its reverse (1221424031), we get a palindrome (2525665252).

The spelling of 1304241221 in words is "one billion, three hundred four million, two hundred forty-one thousand, two hundred twenty-one".