10805021 has 2 divisors, whose sum is σ = 10805022. Its totient is φ = 10805020.

The previous prime is 10804931. The next prime is 10805029. The reversal of 10805021 is 12050801.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10797796 + 7225 = 3286^2 + 85^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10805021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10805029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5402510 + 5402511.

It is an arithmetic number, because the mean of its divisors is an integer number (5402511).

Almost surely, 2^10805021 is an apocalyptic number.

It is an amenable number.

10805021 is a deficient number, since it is larger than the sum of its proper divisors (1).

10805021 is an equidigital number, since it uses as much as digits as its factorization.

10805021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 10805021 is about 3287.0991770861. The cubic root of 10805021 is about 221.0761392820.

Adding to 10805021 its reverse (12050801), we get a palindrome (22855822).

The spelling of 10805021 in words is "ten million, eight hundred five thousand, twenty-one".