1305401421 has 4 divisors (see below), whose sum is σ = 1740535232. Its totient is φ = 870267612.

The previous prime is 1305401417. The next prime is 1305401443. The reversal of 1305401421 is 1241045031.

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 1305401421 - 2² = 1305401417 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1305401411) 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, 217566901 + ... + 217566906.

It is an arithmetic number, because the mean of its divisors is an integer number (435133808).

Almost surely, 2^1305401421 is an apocalyptic number.

It is an amenable number.

1305401421 is a deficient number, since it is larger than the sum of its proper divisors (435133811).

1305401421 is an equidigital number, since it uses as much as digits as its factorization.

1305401421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435133810.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 1305401421 is about 36130.3393424418. The cubic root of 1305401421 is about 1092.9023514396.

Adding to 1305401421 its reverse (1241045031), we get a palindrome (2546446452).

The spelling of 1305401421 in words is "one billion, three hundred five million, four hundred one thousand, four hundred twenty-one".