21573103 has 8 divisors (see below), whose sum is σ = 22572000. Its totient is φ = 20579328.

The previous prime is 21573089. The next prime is 21573121. The reversal of 21573103 is 30137512.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21573103 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 (21573163) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9283 + ... + 11371.

It is an arithmetic number, because the mean of its divisors is an integer number (2821500).

Almost surely, 2^21573103 is an apocalyptic number.

21573103 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21573103 is a deficient number, since it is larger than the sum of its proper divisors (998897).

21573103 is a wasteful number, since it uses less digits than its factorization.

21573103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2561.

The product of its (nonzero) digits is 630, while the sum is 22.

The square root of 21573103 is about 4644.6854575956. The cubic root of 21573103 is about 278.3796849511.

The spelling of 21573103 in words is "twenty-one million, five hundred seventy-three thousand, one hundred three".