4248407721 has 4 divisors (see below), whose sum is σ = 5664543632. Its totient is φ = 2832271812.

The previous prime is 4248407719. The next prime is 4248407753. The reversal of 4248407721 is 1277048424.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 4248407721 - 2¹ = 4248407719 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4248407721.

It is not an unprimeable number, because it can be changed into a prime (4248407921) 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 3 ways as a sum of consecutive naturals, for example, 708067951 + ... + 708067956.

It is an arithmetic number, because the mean of its divisors is an integer number (1416135908).

Almost surely, 2^4248407721 is an apocalyptic number.

It is an amenable number.

4248407721 is a deficient number, since it is larger than the sum of its proper divisors (1416135911).

4248407721 is a wasteful number, since it uses less digits than its factorization.

4248407721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1416135910.

The product of its (nonzero) digits is 100352, while the sum is 39.

The square root of 4248407721 is about 65179.8106855183. The cubic root of 4248407721 is about 1619.6035865143.

The spelling of 4248407721 in words is "four billion, two hundred forty-eight million, four hundred seven thousand, seven hundred twenty-one".