10399021 has 2 divisors, whose sum is σ = 10399022. Its totient is φ = 10399020.

The previous prime is 10399001. The next prime is 10399031. The reversal of 10399021 is 12099301.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7209225 + 3189796 = 2685^2 + 1786^2 .

It is an emirp because it is prime and its reverse (12099301) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 10399021 - 2¹¹ = 10396973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10399001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5199510 + 5199511.

It is an arithmetic number, because the mean of its divisors is an integer number (5199511).

Almost surely, 2^10399021 is an apocalyptic number.

It is an amenable number.

10399021 is a deficient number, since it is larger than the sum of its proper divisors (1).

10399021 is an equidigital number, since it uses as much as digits as its factorization.

10399021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 10399021 is about 3224.7513082407. The cubic root of 10399021 is about 218.2717272073.

The spelling of 10399021 in words is "ten million, three hundred ninety-nine thousand, twenty-one".