21124103 has 32 divisors (see below), whose sum is σ = 29030400. Its totient is φ = 14837760.

The previous prime is 21124099. The next prime is 21124123. The reversal of 21124103 is 30142112.

It is not a de Polignac number, because 21124103 - 2² = 21124099 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21124123) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46823 + ... + 47271.

It is an arithmetic number, because the mean of its divisors is an integer number (907200).

Almost surely, 2^21124103 is an apocalyptic number.

21124103 is a deficient number, since it is larger than the sum of its proper divisors (7906297).

21124103 is a wasteful number, since it uses less digits than its factorization.

21124103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 527.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 21124103 is about 4596.0964959409. The cubic root of 21124103 is about 276.4348279572.

Adding to 21124103 its reverse (30142112), we get a palindrome (51266215).

Subtracting 21124103 from its reverse (30142112), we obtain a square (9018009 = 3003²).

The spelling of 21124103 in words is "twenty-one million, one hundred twenty-four thousand, one hundred three".