21822923 has 2 divisors, whose sum is σ = 21822924. Its totient is φ = 21822922.

The previous prime is 21822907. The next prime is 21822943. The reversal of 21822923 is 32922812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21822923 - 2⁴ = 21822907 is a prime.

It is not a weakly prime, because it can be changed into another prime (21822943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10911461 + 10911462.

It is an arithmetic number, because the mean of its divisors is an integer number (10911462).

Almost surely, 2^21822923 is an apocalyptic number.

21822923 is a deficient number, since it is larger than the sum of its proper divisors (1).

21822923 is an equidigital number, since it uses as much as digits as its factorization.

21822923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 29.

The square root of 21822923 is about 4671.5011505939. The cubic root of 21822923 is about 279.4501240684.

The spelling of 21822923 in words is "twenty-one million, eight hundred twenty-two thousand, nine hundred twenty-three".