21610103 has 2 divisors, whose sum is σ = 21610104. Its totient is φ = 21610102.

The previous prime is 21610093. The next prime is 21610151. The reversal of 21610103 is 30101612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21610103 - 2¹² = 21606007 is a prime.

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

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21610003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10805051 + 10805052.

It is an arithmetic number, because the mean of its divisors is an integer number (10805052).

Almost surely, 2^21610103 is an apocalyptic number.

21610103 is a deficient number, since it is larger than the sum of its proper divisors (1).

21610103 is an equidigital number, since it uses as much as digits as its factorization.

21610103 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 21610103 is about 4648.6667981261. Note that the first 3 decimals coincide. The cubic root of 21610103 is about 278.5387435933.

Adding to 21610103 its reverse (30101612), we get a palindrome (51711715).

The spelling of 21610103 in words is "twenty-one million, six hundred ten thousand, one hundred three".