10021819 has 2 divisors, whose sum is σ = 10021820. Its totient is φ = 10021818.

The previous prime is 10021777. The next prime is 10021829. The reversal of 10021819 is 91812001.

It is a strong prime.

It is an emirp because it is prime and its reverse (91812001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 10021819 - 2¹¹ = 10019771 is a prime.

It is a super-2 number, since 2×10021819² = 200873712137522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 10021819.

It is not a weakly prime, because it can be changed into another prime (10021829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5010909 + 5010910.

It is an arithmetic number, because the mean of its divisors is an integer number (5010910).

Almost surely, 2^10021819 is an apocalyptic number.

10021819 is a deficient number, since it is larger than the sum of its proper divisors (1).

10021819 is an equidigital number, since it uses as much as digits as its factorization.

10021819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 22.

The square root of 10021819 is about 3165.7256672049. The cubic root of 10021819 is about 215.6000472140.

The spelling of 10021819 in words is "ten million, twenty-one thousand, eight hundred nineteen".