21123232103 has 8 divisors (see below), whose sum is σ = 21771190896. Its totient is φ = 20481595200.

The previous prime is 21123232099. The next prime is 21123232133. The reversal of 21123232103 is 30123232112.

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

It is a cyclic number.

It is not a de Polignac number, because 21123232103 - 2² = 21123232099 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21123232133) 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, 1573688 + ... + 1587053.

It is an arithmetic number, because the mean of its divisors is an integer number (2721398862).

Almost surely, 2^21123232103 is an apocalyptic number.

21123232103 is a deficient number, since it is larger than the sum of its proper divisors (647958793).

21123232103 is a wasteful number, since it uses less digits than its factorization.

21123232103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3160945.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21123232103 its reverse (30123232112), we get a palindrome (51246464215).

Subtracting 21123232103 from its reverse (30123232112), we obtain a palindrome (9000000009).

The spelling of 21123232103 in words is "twenty-one billion, one hundred twenty-three million, two hundred thirty-two thousand, one hundred three".