4182821921 has 2 divisors, whose sum is σ = 4182821922. Its totient is φ = 4182821920.

The previous prime is 4182821897. The next prime is 4182821941. The reversal of 4182821921 is 1291282814.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4176390625 + 6431296 = 64625^2 + 2536^2 .

It is a cyclic number.

It is not a de Polignac number, because 4182821921 - 2³⁰ = 3109080097 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (4182821941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2091410960 + 2091410961.

It is an arithmetic number, because the mean of its divisors is an integer number (2091410961).

Almost surely, 2^4182821921 is an apocalyptic number.

It is an amenable number.

4182821921 is a deficient number, since it is larger than the sum of its proper divisors (1).

4182821921 is an equidigital number, since it uses as much as digits as its factorization.

4182821921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18432, while the sum is 38.

The square root of 4182821921 is about 64674.7394351149. The cubic root of 4182821921 is about 1611.2259891502.

The spelling of 4182821921 in words is "four billion, one hundred eighty-two million, eight hundred twenty-one thousand, nine hundred twenty-one".