21580103 has 4 divisors (see below), whose sum is σ = 21737760. Its totient is φ = 21422448.

The previous prime is 21580079. The next prime is 21580127. The reversal of 21580103 is 30108512.

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

It is an interprime number because it is at equal distance from previous prime (21580079) and next prime (21580127).

It is a cyclic number.

It is not a de Polignac number, because 21580103 - 2²² = 17385799 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 (21580133) 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, 78623 + ... + 78896.

It is an arithmetic number, because the mean of its divisors is an integer number (5434440).

Almost surely, 2^21580103 is an apocalyptic number.

21580103 is a deficient number, since it is larger than the sum of its proper divisors (157657).

21580103 is a wasteful number, since it uses less digits than its factorization.

21580103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157656.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 21580103 is about 4645.4389458909. The cubic root of 21580103 is about 278.4097910677.

Adding to 21580103 its reverse (30108512), we get a palindrome (51688615).

The spelling of 21580103 in words is "twenty-one million, five hundred eighty thousand, one hundred three".