21331023503 has 2 divisors, whose sum is σ = 21331023504. Its totient is φ = 21331023502.

The previous prime is 21331023463. The next prime is 21331023533. The reversal of 21331023503 is 30532013312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21331023503 - 2¹² = 21331019407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21331023533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10665511751 + 10665511752.

It is an arithmetic number, because the mean of its divisors is an integer number (10665511752).

Almost surely, 2^21331023503 is an apocalyptic number.

21331023503 is a deficient number, since it is larger than the sum of its proper divisors (1).

21331023503 is an equidigital number, since it uses as much as digits as its factorization.

21331023503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 23.

Adding to 21331023503 its reverse (30532013312), we get a palindrome (51863036815).

The spelling of 21331023503 in words is "twenty-one billion, three hundred thirty-one million, twenty-three thousand, five hundred three".