21108003 has 8 divisors (see below), whose sum is σ = 32164608. Its totient is φ = 12061704.

The previous prime is 21107987. The next prime is 21108007. The reversal of 21108003 is 30080112.

It is a happy number.

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

It is not a de Polignac number, because 21108003 - 2⁴ = 21107987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21108007) 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, 502551 + ... + 502592.

It is an arithmetic number, because the mean of its divisors is an integer number (4020576).

Almost surely, 2^21108003 is an apocalyptic number.

21108003 is a deficient number, since it is larger than the sum of its proper divisors (11056605).

21108003 is a wasteful number, since it uses less digits than its factorization.

21108003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1005153.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 21108003 is about 4594.3446757944. The cubic root of 21108003 is about 276.3645806840.

Adding to 21108003 its reverse (30080112), we get a palindrome (51188115).

The spelling of 21108003 in words is "twenty-one million, one hundred eight thousand, three".