21033110103 has 4 divisors (see below), whose sum is σ = 28044146808. Its totient is φ = 14022073400.

The previous prime is 21033110099. The next prime is 21033110191. The reversal of 21033110103 is 30101133012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21033110103 - 2² = 21033110099 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21033110603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3505518348 + ... + 3505518353.

It is an arithmetic number, because the mean of its divisors is an integer number (7011036702).

Almost surely, 2^21033110103 is an apocalyptic number.

21033110103 is a deficient number, since it is larger than the sum of its proper divisors (7011036705).

21033110103 is an equidigital number, since it uses as much as digits as its factorization.

21033110103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7011036704.

The product of its (nonzero) digits is 54, while the sum is 15.

Adding to 21033110103 its reverse (30101133012), we get a palindrome (51134243115).

The spelling of 21033110103 in words is "twenty-one billion, thirty-three million, one hundred ten thousand, one hundred three".