21823103 has 2 divisors, whose sum is σ = 21823104. Its totient is φ = 21823102.

The previous prime is 21823091. The next prime is 21823117. The reversal of 21823103 is 30132812.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21823103 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21820103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10911551 + 10911552.

It is an arithmetic number, because the mean of its divisors is an integer number (10911552).

Almost surely, 2^21823103 is an apocalyptic number.

21823103 is a deficient number, since it is larger than the sum of its proper divisors (1).

21823103 is an equidigital number, since it uses as much as digits as its factorization.

21823103 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 21823103 is about 4671.5204163099. The cubic root of 21823103 is about 279.4508923872.

Adding to 21823103 its reverse (30132812), we get a palindrome (51955915).

The spelling of 21823103 in words is "twenty-one million, eight hundred twenty-three thousand, one hundred three".