10228921 has 2 divisors, whose sum is σ = 10228922. Its totient is φ = 10228920.

The previous prime is 10228919. The next prime is 10228931. The reversal of 10228921 is 12982201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5546025 + 4682896 = 2355^2 + 2164^2 .

It is a cyclic number.

It is not a de Polignac number, because 10228921 - 2¹ = 10228919 is a prime.

Together with 10228919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (10228901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5114460 + 5114461.

It is an arithmetic number, because the mean of its divisors is an integer number (5114461).

Almost surely, 2^10228921 is an apocalyptic number.

It is an amenable number.

10228921 is a deficient number, since it is larger than the sum of its proper divisors (1).

10228921 is an equidigital number, since it uses as much as digits as its factorization.

10228921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 10228921 is about 3198.2684377644. The cubic root of 10228921 is about 217.0750658771.

The spelling of 10228921 in words is "ten million, two hundred twenty-eight thousand, nine hundred twenty-one".