10091021 has 2 divisors, whose sum is σ = 10091022. Its totient is φ = 10091020.

The previous prime is 10090999. The next prime is 10091023. The reversal of 10091021 is 12019001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6832996 + 3258025 = 2614^2 + 1805^2 .

It is a cyclic number.

It is not a de Polignac number, because 10091021 - 2¹⁸ = 9828877 is a prime.

Together with 10091023, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 10090987 and 10091005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10091023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5045510 + 5045511.

It is an arithmetic number, because the mean of its divisors is an integer number (5045511).

Almost surely, 2^10091021 is an apocalyptic number.

It is an amenable number.

10091021 is a deficient number, since it is larger than the sum of its proper divisors (1).

10091021 is an equidigital number, since it uses as much as digits as its factorization.

10091021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18, while the sum is 14.

The square root of 10091021 is about 3176.6367434757. The cubic root of 10091021 is about 216.0951584035.

The spelling of 10091021 in words is "ten million, ninety-one thousand, twenty-one".