21231303103 has 4 divisors (see below), whose sum is σ = 21233216880. Its totient is φ = 21229389328.

The previous prime is 21231303053. The next prime is 21231303109. The reversal of 21231303103 is 30130313212.

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 21231303103 - 2¹⁷ = 21231172031 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231303109) 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, 940150 + ... + 962467.

It is an arithmetic number, because the mean of its divisors is an integer number (5308304220).

Almost surely, 2^21231303103 is an apocalyptic number.

21231303103 is a deficient number, since it is larger than the sum of its proper divisors (1913777).

21231303103 is a wasteful number, since it uses less digits than its factorization.

21231303103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1913776.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 21231303103 its reverse (30130313212), we get a palindrome (51361616315).

The spelling of 21231303103 in words is "twenty-one billion, two hundred thirty-one million, three hundred three thousand, one hundred three".