21363103 has 2 divisors, whose sum is σ = 21363104. Its totient is φ = 21363102.

The previous prime is 21363079. The next prime is 21363107. The reversal of 21363103 is 30136312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21363103 - 2¹³ = 21354911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21363107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10681551 + 10681552.

It is an arithmetic number, because the mean of its divisors is an integer number (10681552).

Almost surely, 2^21363103 is an apocalyptic number.

21363103 is a deficient number, since it is larger than the sum of its proper divisors (1).

21363103 is an equidigital number, since it uses as much as digits as its factorization.

21363103 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 19.

The square root of 21363103 is about 4622.0236909821. The cubic root of 21363103 is about 277.4734568666.

Adding to 21363103 its reverse (30136312), we get a palindrome (51499415).

The spelling of 21363103 in words is "twenty-one million, three hundred sixty-three thousand, one hundred three".