10421120221 has 2 divisors, whose sum is σ = 10421120222. Its totient is φ = 10421120220.

The previous prime is 10421120201. The next prime is 10421120243. The reversal of 10421120221 is 12202112401.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8260264996 + 2160855225 = 90886^2 + 46485^2 .

It is a cyclic number.

It is not a de Polignac number, because 10421120221 - 2¹¹ = 10421118173 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10421120195 and 10421120204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10421120201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5210560110 + 5210560111.

It is an arithmetic number, because the mean of its divisors is an integer number (5210560111).

Almost surely, 2^10421120221 is an apocalyptic number.

It is an amenable number.

10421120221 is a deficient number, since it is larger than the sum of its proper divisors (1).

10421120221 is an equidigital number, since it uses as much as digits as its factorization.

10421120221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 10421120221 its reverse (12202112401), we get a palindrome (22623232622).

The spelling of 10421120221 in words is "ten billion, four hundred twenty-one million, one hundred twenty thousand, two hundred twenty-one".