21230103 has 4 divisors (see below), whose sum is σ = 28306808. Its totient is φ = 14153400.

The previous prime is 21230047. The next prime is 21230123. The reversal of 21230103 is 30103212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21230103 - 2⁸ = 21229847 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21230123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3538348 + ... + 3538353.

It is an arithmetic number, because the mean of its divisors is an integer number (7076702).

Almost surely, 2^21230103 is an apocalyptic number.

21230103 is a deficient number, since it is larger than the sum of its proper divisors (7076705).

21230103 is an equidigital number, since it uses as much as digits as its factorization.

21230103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7076704.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 21230103 is about 4607.6135905694. The cubic root of 21230103 is about 276.8964367595.

Adding to 21230103 its reverse (30103212), we get a palindrome (51333315).

It can be divided in two parts, 212 and 30103, that multiplied together give a palindrome (6381836).

The spelling of 21230103 in words is "twenty-one million, two hundred thirty thousand, one hundred three".