1305423021305 has 16 divisors (see below), whose sum is σ = 1689043273680. Its totient is φ = 962841800448.

The previous prime is 1305423021277. The next prime is 1305423021307. The reversal of 1305423021305 is 5031203245031.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 34725949801 + 1270697071504 = 186349^2 + 1127252^2 .

It is a cyclic number.

It is not a de Polignac number, because 1305423021305 - 2²⁸ = 1305154585849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1305423021307) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12059162 + ... + 12166931.

It is an arithmetic number, because the mean of its divisors is an integer number (105565204605).

Almost surely, 2^{1305423021305} is an apocalyptic number.

It is an amenable number.

1305423021305 is a deficient number, since it is larger than the sum of its proper divisors (383620252375).

1305423021305 is a wasteful number, since it uses less digits than its factorization.

1305423021305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24226940.

The product of its (nonzero) digits is 10800, while the sum is 29.

Adding to 1305423021305 its reverse (5031203245031), we get a palindrome (6336626266336).

The spelling of 1305423021305 in words is "one trillion, three hundred five billion, four hundred twenty-three million, twenty-one thousand, three hundred five".