4030815120721 has 9 divisors (see below), whose sum is σ = 4036712283849. Its totient is φ = 4024926568884.

The previous prime is 4030815120713. The next prime is 4030815120779. The reversal of 4030815120721 is 1270215180304.

The square root of 4030815120721 is 2007689.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 4030815120721 - 2³ = 4030815120713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4030815123721) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2182357020 + ... + 2182358866.

Almost surely, 2^{4030815120721} is an apocalyptic number.

4030815120721 is the 2007689-th square number.

4030815120721 is the 1003845-th centered octagonal number.

It is an amenable number.

4030815120721 is a deficient number, since it is larger than the sum of its proper divisors (5897163128).

4030815120721 is an frugal number, since it uses more digits than its factorization.

4030815120721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5868 (or 2934 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 34.

The spelling of 4030815120721 in words is "four trillion, thirty billion, eight hundred fifteen million, one hundred twenty thousand, seven hundred twenty-one".