1000021823 has 2 divisors, whose sum is σ = 1000021824. Its totient is φ = 1000021822.

The previous prime is 1000021801. The next prime is 1000021843. The reversal of 1000021823 is 3281200001.

It is a strong prime.

It is an emirp because it is prime and its reverse (3281200001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1000021823 - 2¹⁰ = 1000020799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1000021843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500010911 + 500010912.

It is an arithmetic number, because the mean of its divisors is an integer number (500010912).

Almost surely, 2^1000021823 is an apocalyptic number.

1000021823 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000021823 is an equidigital number, since it uses as much as digits as its factorization.

1000021823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 1000021823 is about 31623.1216517282. The cubic root of 1000021823 is about 1000.0072742804.

Adding to 1000021823 its reverse (3281200001), we get a palindrome (4281221824).

The spelling of 1000021823 in words is "one billion, twenty-one thousand, eight hundred twenty-three".