21054103 has 8 divisors (see below), whose sum is σ = 24092672. Its totient is φ = 18023256.

The previous prime is 21054067. The next prime is 21054119. The reversal of 21054103 is 30145012.

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-21054103 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21054403) 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, 6226 + ... + 8992.

It is an arithmetic number, because the mean of its divisors is an integer number (3011584).

Almost surely, 2^21054103 is an apocalyptic number.

21054103 is a deficient number, since it is larger than the sum of its proper divisors (3038569).

21054103 is a wasteful number, since it uses less digits than its factorization.

21054103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3861.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 21054103 is about 4588.4750190014. The cubic root of 21054103 is about 276.1291447357.

Adding to 21054103 its reverse (30145012), we get a palindrome (51199115).

Subtracting 21054103 from its reverse (30145012), we obtain a palindrome (9090909).

The spelling of 21054103 in words is "twenty-one million, fifty-four thousand, one hundred three".