2305145721 has 16 divisors (see below), whose sum is σ = 3375959040. Its totient is φ = 1392581520.

The previous prime is 2305145681. The next prime is 2305145723. The reversal of 2305145721 is 1275415032.

It is not a de Polignac number, because 2305145721 - 2¹⁰ = 2305144697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2305145723) 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, 877845 + ... + 880466.

It is an arithmetic number, because the mean of its divisors is an integer number (210997440).

Almost surely, 2^2305145721 is an apocalyptic number.

It is an amenable number.

2305145721 is a deficient number, since it is larger than the sum of its proper divisors (1070813319).

2305145721 is a wasteful number, since it uses less digits than its factorization.

2305145721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1758356.

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 2305145721 is about 48011.9331104258. The cubic root of 2305145721 is about 1320.9897919470.

The spelling of 2305145721 in words is "two billion, three hundred five million, one hundred forty-five thousand, seven hundred twenty-one".