10321268821 has 2 divisors, whose sum is σ = 10321268822. Its totient is φ = 10321268820.

The previous prime is 10321268819. The next prime is 10321268831. The reversal of 10321268821 is 12886212301.

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., 7024786596 + 3296482225 = 83814^2 + 57415^2 .

It is a cyclic number.

It is not a de Polignac number, because 10321268821 - 2¹ = 10321268819 is a prime.

Together with 10321268819, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10321268831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5160634410 + 5160634411.

It is an arithmetic number, because the mean of its divisors is an integer number (5160634411).

Almost surely, 2^10321268821 is an apocalyptic number.

It is an amenable number.

10321268821 is a deficient number, since it is larger than the sum of its proper divisors (1).

10321268821 is an equidigital number, since it uses as much as digits as its factorization.

10321268821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 34.

The spelling of 10321268821 in words is "ten billion, three hundred twenty-one million, two hundred sixty-eight thousand, eight hundred twenty-one".