4243291921 has 16 divisors (see below), whose sum is σ = 4673547648. Its totient is φ = 3820608000.

The previous prime is 4243291889. The next prime is 4243291931. The reversal of 4243291921 is 1291923424.

It is not a de Polignac number, because 4243291921 - 2⁵ = 4243291889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (4243291931) 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, 582715 + ... + 589951.

It is an arithmetic number, because the mean of its divisors is an integer number (292096728).

Almost surely, 2^4243291921 is an apocalyptic number.

It is an amenable number.

4243291921 is a deficient number, since it is larger than the sum of its proper divisors (430255727).

4243291921 is a wasteful number, since it uses less digits than its factorization.

4243291921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7752.

The product of its digits is 31104, while the sum is 37.

The square root of 4243291921 is about 65140.5551173768. Note that the first 3 decimals coincide. The cubic root of 4243291921 is about 1618.9532333671.

The spelling of 4243291921 in words is "four billion, two hundred forty-three million, two hundred ninety-one thousand, nine hundred twenty-one".