10420421321 has 2 divisors, whose sum is σ = 10420421322. Its totient is φ = 10420421320.

The previous prime is 10420421311. The next prime is 10420421327. The reversal of 10420421321 is 12312402401.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9634404025 + 786017296 = 98155^2 + 28036^2 .

It is a cyclic number.

It is not a de Polignac number, because 10420421321 - 2²⁶ = 10353312457 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10420421293 and 10420421302.

It is not a weakly prime, because it can be changed into another prime (10420421327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5210210660 + 5210210661.

It is an arithmetic number, because the mean of its divisors is an integer number (5210210661).

Almost surely, 2^10420421321 is an apocalyptic number.

It is an amenable number.

10420421321 is a deficient number, since it is larger than the sum of its proper divisors (1).

10420421321 is an equidigital number, since it uses as much as digits as its factorization.

10420421321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 10420421321 its reverse (12312402401), we get a palindrome (22732823722).

The spelling of 10420421321 in words is "ten billion, four hundred twenty million, four hundred twenty-one thousand, three hundred twenty-one".