21331323103 has 4 divisors (see below), whose sum is σ = 21363990408. Its totient is φ = 21298655800.

The previous prime is 21331323089. The next prime is 21331323149. The reversal of 21331323103 is 30132313312.

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 21331323103 - 2⁵ = 21331323071 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 (21331323163) 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, 16332673 + ... + 16333978.

It is an arithmetic number, because the mean of its divisors is an integer number (5340997602).

Almost surely, 2^21331323103 is an apocalyptic number.

21331323103 is a deficient number, since it is larger than the sum of its proper divisors (32667305).

21331323103 is an equidigital number, since it uses as much as digits as its factorization.

21331323103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32667304.

The product of its (nonzero) digits is 972, while the sum is 22.

Adding to 21331323103 its reverse (30132313312), we get a palindrome (51463636415).

The spelling of 21331323103 in words is "twenty-one billion, three hundred thirty-one million, three hundred twenty-three thousand, one hundred three".