21245103 has 24 divisors (see below), whose sum is σ = 34117200. Its totient is φ = 12629760.

The previous prime is 21245099. The next prime is 21245111. The reversal of 21245103 is 30154212.

21245103 is a `hidden beast` number, since 212 + 451 + 0 + 3 = 666.

It is not a de Polignac number, because 21245103 - 2² = 21245099 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21245153) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3223 + ... + 7271.

It is an arithmetic number, because the mean of its divisors is an integer number (1421550).

Almost surely, 2^21245103 is an apocalyptic number.

21245103 is a deficient number, since it is larger than the sum of its proper divisors (12872097).

21245103 is a wasteful number, since it uses less digits than its factorization.

21245103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4119 (or 4116 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 21245103 is about 4609.2410438162. The cubic root of 21245103 is about 276.9616345706.

Adding to 21245103 its reverse (30154212), we get a palindrome (51399315).

It can be divided in two parts, 2124 and 5103, that added together give a palindrome (7227).

The spelling of 21245103 in words is "twenty-one million, two hundred forty-five thousand, one hundred three".