21022103 has 2 divisors, whose sum is σ = 21022104. Its totient is φ = 21022102.

The previous prime is 21022097. The next prime is 21022117. The reversal of 21022103 is 30122012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21022103 - 2²² = 16827799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21022163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511051 + 10511052.

It is an arithmetic number, because the mean of its divisors is an integer number (10511052).

Almost surely, 2^21022103 is an apocalyptic number.

21022103 is a deficient number, since it is larger than the sum of its proper divisors (1).

21022103 is an equidigital number, since it uses as much as digits as its factorization.

21022103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 21022103 is about 4584.9866957277. The cubic root of 21022103 is about 275.9891781446.

Adding to 21022103 its reverse (30122012), we get a palindrome (51144115).

Subtracting 21022103 from its reverse (30122012), we obtain a palindrome (9099909).

The spelling of 21022103 in words is "twenty-one million, twenty-two thousand, one hundred three".