21103461 has 12 divisors (see below), whose sum is σ = 30613440. Its totient is φ = 14008680.

The previous prime is 21103457. The next prime is 21103493. The reversal of 21103461 is 16430112.

It is a happy number.

It is not a de Polignac number, because 21103461 - 2² = 21103457 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21103441) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2755 + ... + 7056.

It is an arithmetic number, because the mean of its divisors is an integer number (2551120).

Almost surely, 2^21103461 is an apocalyptic number.

It is an amenable number.

21103461 is a deficient number, since it is larger than the sum of its proper divisors (9509979).

21103461 is a wasteful number, since it uses less digits than its factorization.

21103461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10056 (or 10053 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 21103461 is about 4593.8503458428. The cubic root of 21103461 is about 276.3447566395.

Adding to 21103461 its reverse (16430112), we get a palindrome (37533573).

The spelling of 21103461 in words is "twenty-one million, one hundred three thousand, four hundred sixty-one".