4866821 has 2 divisors, whose sum is σ = 4866822. Its totient is φ = 4866820.

The previous prime is 4866791. The next prime is 4866847. The reversal of 4866821 is 1286684.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3189796 + 1677025 = 1786^2 + 1295^2 .

It is a cyclic number.

It is not a de Polignac number, because 4866821 - 2¹⁰ = 4865797 is a prime.

It is equal to p₃₃₉₇₉₄ and since 4866821 and 339794 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4866221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2433410 + 2433411.

It is an arithmetic number, because the mean of its divisors is an integer number (2433411).

Almost surely, 2^4866821 is an apocalyptic number.

It is an amenable number.

4866821 is a deficient number, since it is larger than the sum of its proper divisors (1).

4866821 is an equidigital number, since it uses as much as digits as its factorization.

4866821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18432, while the sum is 35.

The square root of 4866821 is about 2206.0872602869. The cubic root of 4866821 is about 169.4656926821.

The spelling of 4866821 in words is "four million, eight hundred sixty-six thousand, eight hundred twenty-one".