305242800721 has 2 divisors, whose sum is σ = 305242800722. Its totient is φ = 305242800720.

The previous prime is 305242800713. The next prime is 305242800743. The reversal of 305242800721 is 127008242503.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 155148544321 + 150094256400 = 393889^2 + 387420^2 .

It is a cyclic number.

It is not a de Polignac number, because 305242800721 - 2³ = 305242800713 is a prime.

It is not a weakly prime, because it can be changed into another prime (305242800701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152621400360 + 152621400361.

It is an arithmetic number, because the mean of its divisors is an integer number (152621400361).

Almost surely, 2^305242800721 is an apocalyptic number.

It is an amenable number.

305242800721 is a deficient number, since it is larger than the sum of its proper divisors (1).

305242800721 is an equidigital number, since it uses as much as digits as its factorization.

305242800721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26880, while the sum is 34.

The spelling of 305242800721 in words is "three hundred five billion, two hundred forty-two million, eight hundred thousand, seven hundred twenty-one".