4130720721 has 6 divisors (see below), whose sum is σ = 5966596610. Its totient is φ = 2753813808.

The previous prime is 4130720717. The next prime is 4130720747. The reversal of 4130720721 is 1270270314.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 2365460496 + 1765260225 = 48636^2 + 42015^2 .

It is not a de Polignac number, because 4130720721 - 2² = 4130720717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4130720701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 229484476 + ... + 229484493.

Almost surely, 2^4130720721 is an apocalyptic number.

It is an amenable number.

4130720721 is a deficient number, since it is larger than the sum of its proper divisors (1835875889).

4130720721 is a wasteful number, since it uses less digits than its factorization.

4130720721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 458968975 (or 458968972 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 4130720721 is about 64270.6832155999. The cubic root of 4130720721 is about 1604.5082127941.

The spelling of 4130720721 in words is "four billion, one hundred thirty million, seven hundred twenty thousand, seven hundred twenty-one".