21239103 has 16 divisors (see below), whose sum is σ = 30088800. Its totient is φ = 13280256.

The previous prime is 21239087. The next prime is 21239173. The reversal of 21239103 is 30193212.

It is a happy number.

It is not a de Polignac number, because 21239103 - 2⁴ = 21239087 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21239103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21239173) 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, 19723 + ... + 20771.

It is an arithmetic number, because the mean of its divisors is an integer number (1880550).

Almost surely, 2^21239103 is an apocalyptic number.

21239103 is a deficient number, since it is larger than the sum of its proper divisors (8849697).

21239103 is a wasteful number, since it uses less digits than its factorization.

21239103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1466.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 21239103 is about 4608.5901314827. The cubic root of 21239103 is about 276.9355591299.

The spelling of 21239103 in words is "twenty-one million, two hundred thirty-nine thousand, one hundred three".