4242783721 has 16 divisors (see below), whose sum is σ = 5058851328. Its totient is φ = 3513081600.

The previous prime is 4242783709. The next prime is 4242783749. The reversal of 4242783721 is 1273872424.

It is a cyclic number.

It is not a de Polignac number, because 4242783721 - 2¹⁷ = 4242652649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4242783221) 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, 360150 + ... + 371743.

It is an arithmetic number, because the mean of its divisors is an integer number (316178208).

Almost surely, 2^4242783721 is an apocalyptic number.

It is an amenable number.

4242783721 is a deficient number, since it is larger than the sum of its proper divisors (816067607).

4242783721 is a wasteful number, since it uses less digits than its factorization.

4242783721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 731952.

The product of its digits is 150528, while the sum is 40.

The square root of 4242783721 is about 65136.6542048331. The cubic root of 4242783721 is about 1618.8885992028. Note that the first 3 decimals are identical.

The spelling of 4242783721 in words is "four billion, two hundred forty-two million, seven hundred eighty-three thousand, seven hundred twenty-one".