10220921 has 2 divisors, whose sum is σ = 10220922. Its totient is φ = 10220920.

The previous prime is 10220911. The next prime is 10220923. The reversal of 10220921 is 12902201.

10220921 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5221225 + 4999696 = 2285^2 + 2236^2 .

It is a cyclic number.

It is not a de Polignac number, because 10220921 - 2¹⁰ = 10219897 is a prime.

Together with 10220923, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 10220921.

It is not a weakly prime, because it can be changed into another prime (10220923) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5110460 + 5110461.

It is an arithmetic number, because the mean of its divisors is an integer number (5110461).

Almost surely, 2^10220921 is an apocalyptic number.

It is an amenable number.

10220921 is a deficient number, since it is larger than the sum of its proper divisors (1).

10220921 is an equidigital number, since it uses as much as digits as its factorization.

10220921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 10220921 is about 3197.0175163737. The cubic root of 10220921 is about 217.0184599245.

The spelling of 10220921 in words is "ten million, two hundred twenty thousand, nine hundred twenty-one".