4021663 has 2 divisors, whose sum is σ = 4021664. Its totient is φ = 4021662.

The previous prime is 4021657. The next prime is 4021727. The reversal of 4021663 is 3661204.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4021663 - 2⁹ = 4021151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4021613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2010831 + 2010832.

It is an arithmetic number, because the mean of its divisors is an integer number (2010832).

Almost surely, 2^4021663 is an apocalyptic number.

4021663 is a deficient number, since it is larger than the sum of its proper divisors (1).

4021663 is an equidigital number, since it uses as much as digits as its factorization.

4021663 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 4021663 is about 2005.4084372018. The cubic root of 4021663 is about 159.0261550001.

Adding to 4021663 its reverse (3661204), we get a palindrome (7682867).

The spelling of 4021663 in words is "four million, twenty-one thousand, six hundred sixty-three".