4869661421 has 2 divisors, whose sum is σ = 4869661422. Its totient is φ = 4869661420.

The previous prime is 4869661417. The next prime is 4869661519. The reversal of 4869661421 is 1241669684.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4835672521 + 33988900 = 69539^2 + 5830^2 .

It is a cyclic number.

It is not a de Polignac number, because 4869661421 - 2² = 4869661417 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4869661021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2434830710 + 2434830711.

It is an arithmetic number, because the mean of its divisors is an integer number (2434830711).

Almost surely, 2^4869661421 is an apocalyptic number.

It is an amenable number.

4869661421 is a deficient number, since it is larger than the sum of its proper divisors (1).

4869661421 is an equidigital number, since it uses as much as digits as its factorization.

4869661421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 497664, while the sum is 47.

The square root of 4869661421 is about 69782.9593883779. The cubic root of 4869661421 is about 1694.9865467094.

The spelling of 4869661421 in words is "four billion, eight hundred sixty-nine million, six hundred sixty-one thousand, four hundred twenty-one".