4047037921 has 2 divisors, whose sum is σ = 4047037922. Its totient is φ = 4047037920.

The previous prime is 4047037909. The next prime is 4047037927. The reversal of 4047037921 is 1297307404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4016390625 + 30647296 = 63375^2 + 5536^2 .

It is a cyclic number.

It is not a de Polignac number, because 4047037921 - 2⁷ = 4047037793 is a prime.

It is not a weakly prime, because it can be changed into another prime (4047037927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2023518960 + 2023518961.

It is an arithmetic number, because the mean of its divisors is an integer number (2023518961).

Almost surely, 2^4047037921 is an apocalyptic number.

It is an amenable number.

4047037921 is a deficient number, since it is larger than the sum of its proper divisors (1).

4047037921 is an equidigital number, since it uses as much as digits as its factorization.

4047037921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42336, while the sum is 37.

The square root of 4047037921 is about 63616.3337594992. Note that the first 3 decimals coincide. The cubic root of 4047037921 is about 1593.5991566968.

The spelling of 4047037921 in words is "four billion, forty-seven million, thirty-seven thousand, nine hundred twenty-one".