5651321821 has 2 divisors, whose sum is σ = 5651321822. Its totient is φ = 5651321820.

The previous prime is 5651321807. The next prime is 5651321831. The reversal of 5651321821 is 1281231565.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4200854596 + 1450467225 = 64814^2 + 38085^2 .

It is a cyclic number.

It is not a de Polignac number, because 5651321821 - 2⁷ = 5651321693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5651321831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2825660910 + 2825660911.

It is an arithmetic number, because the mean of its divisors is an integer number (2825660911).

Almost surely, 2^5651321821 is an apocalyptic number.

It is an amenable number.

5651321821 is a deficient number, since it is larger than the sum of its proper divisors (1).

5651321821 is an equidigital number, since it uses as much as digits as its factorization.

5651321821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14400, while the sum is 34.

The square root of 5651321821 is about 75175.2740001658. The cubic root of 5651321821 is about 1781.2163782208.

The spelling of 5651321821 in words is "five billion, six hundred fifty-one million, three hundred twenty-one thousand, eight hundred twenty-one".