21046103 has 4 divisors (see below), whose sum is σ = 22665048. Its totient is φ = 19427160.

The previous prime is 21046073. The next prime is 21046111. The reversal of 21046103 is 30164012.

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

It is a cyclic number.

It is not a de Polignac number, because 21046103 - 2¹⁴ = 21029719 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 (21046603) 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 3 ways as a sum of consecutive naturals, for example, 809453 + ... + 809478.

It is an arithmetic number, because the mean of its divisors is an integer number (5666262).

Almost surely, 2^21046103 is an apocalyptic number.

21046103 is a deficient number, since it is larger than the sum of its proper divisors (1618945).

21046103 is a wasteful number, since it uses less digits than its factorization.

21046103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1618944.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 21046103 is about 4587.6031868504. The cubic root of 21046103 is about 276.0941663911.

The spelling of 21046103 in words is "twenty-one million, forty-six thousand, one hundred three".