4268666821 has 2 divisors, whose sum is σ = 4268666822. Its totient is φ = 4268666820.

The previous prime is 4268666789. The next prime is 4268666837. The reversal of 4268666821 is 1286668624.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2807516196 + 1461150625 = 52986^2 + 38225^2 .

It is a cyclic number.

It is not a de Polignac number, because 4268666821 - 2⁵ = 4268666789 is a prime.

It is a super-3 number, since 3×4268666821³ (a number of 30 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4268666321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2134333410 + 2134333411.

It is an arithmetic number, because the mean of its divisors is an integer number (2134333411).

Almost surely, 2^4268666821 is an apocalyptic number.

It is an amenable number.

4268666821 is a deficient number, since it is larger than the sum of its proper divisors (1).

4268666821 is an equidigital number, since it uses as much as digits as its factorization.

4268666821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1327104, while the sum is 49.

The square root of 4268666821 is about 65335.0351725627. The cubic root of 4268666821 is about 1622.1739371986.

The spelling of 4268666821 in words is "four billion, two hundred sixty-eight million, six hundred sixty-six thousand, eight hundred twenty-one".