21032103 has 16 divisors (see below), whose sum is σ = 28675296. Its totient is φ = 13708800.

The previous prime is 21032087. The next prime is 21032119. The reversal of 21032103 is 30123012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21032087) and next prime (21032119).

It is not a de Polignac number, because 21032103 - 2⁴ = 21032087 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21032153) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29653 + ... + 30353.

It is an arithmetic number, because the mean of its divisors is an integer number (1792206).

Almost surely, 2^21032103 is an apocalyptic number.

21032103 is a deficient number, since it is larger than the sum of its proper divisors (7643193).

21032103 is a wasteful number, since it uses less digits than its factorization.

21032103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 914.

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

The square root of 21032103 is about 4586.0770817770. The cubic root of 21032103 is about 276.0329329532.

Adding to 21032103 its reverse (30123012), we get a palindrome (51155115).

Subtracting 21032103 from its reverse (30123012), we obtain a palindrome (9090909).

The spelling of 21032103 in words is "twenty-one million, thirty-two thousand, one hundred three".