21145103 has 8 divisors (see below), whose sum is σ = 24351360. Its totient is φ = 17985240.

The previous prime is 21145079. The next prime is 21145109. The reversal of 21145103 is 30154112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21145103 - 2⁸ = 21144847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21145109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10613 + ... + 12446.

It is an arithmetic number, because the mean of its divisors is an integer number (3043920).

Almost surely, 2^21145103 is an apocalyptic number.

21145103 is a deficient number, since it is larger than the sum of its proper divisors (3206257).

21145103 is a wasteful number, since it uses less digits than its factorization.

21145103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23197.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 21145103 is about 4598.3804757762. The cubic root of 21145103 is about 276.5264012147.

Adding to 21145103 its reverse (30154112), we get a palindrome (51299215).

Subtracting 21145103 from its reverse (30154112), we obtain a palindrome (9009009).

The spelling of 21145103 in words is "twenty-one million, one hundred forty-five thousand, one hundred three".