21149103 has 4 divisors (see below), whose sum is σ = 28198808. Its totient is φ = 14099400.

The previous prime is 21149083. The next prime is 21149129. The reversal of 21149103 is 30194112.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21149103 - 2⁶ = 21149039 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21149103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21149803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3524848 + ... + 3524853.

It is an arithmetic number, because the mean of its divisors is an integer number (7049702).

Almost surely, 2^21149103 is an apocalyptic number.

21149103 is a deficient number, since it is larger than the sum of its proper divisors (7049705).

21149103 is an equidigital number, since it uses as much as digits as its factorization.

21149103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7049704.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 21149103 is about 4598.8153909458. The cubic root of 21149103 is about 276.5438368650.

The spelling of 21149103 in words is "twenty-one million, one hundred forty-nine thousand, one hundred three".