21103010103 has 8 divisors (see below), whose sum is σ = 32156967808. Its totient is φ = 12058862904.

The previous prime is 21103010099. The next prime is 21103010113. The reversal of 21103010103 is 30101030112.

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

It is not a de Polignac number, because 21103010103 - 2² = 21103010099 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21103010113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 502452601 + ... + 502452642.

It is an arithmetic number, because the mean of its divisors is an integer number (4019620976).

Almost surely, 2^21103010103 is an apocalyptic number.

21103010103 is a deficient number, since it is larger than the sum of its proper divisors (11053957705).

21103010103 is a wasteful number, since it uses less digits than its factorization.

21103010103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1004905253.

The product of its (nonzero) digits is 18, while the sum is 12.

Adding to 21103010103 its reverse (30101030112), we get a palindrome (51204040215).

The spelling of 21103010103 in words is "twenty-one billion, one hundred three million, ten thousand, one hundred three".