21321101003 has 2 divisors, whose sum is σ = 21321101004. Its totient is φ = 21321101002.

The previous prime is 21321100963. The next prime is 21321101017. The reversal of 21321101003 is 30010112312.

It is an a-pointer prime, because the next prime (21321101017) can be obtained adding 21321101003 to its sum of digits (14).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21321101003 - 2⁶ = 21321100939 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21321101033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660550501 + 10660550502.

It is an arithmetic number, because the mean of its divisors is an integer number (10660550502).

Almost surely, 2^21321101003 is an apocalyptic number.

21321101003 is a deficient number, since it is larger than the sum of its proper divisors (1).

21321101003 is an equidigital number, since it uses as much as digits as its factorization.

21321101003 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21321101003 its reverse (30010112312), we get a palindrome (51331213315).

The spelling of 21321101003 in words is "twenty-one billion, three hundred twenty-one million, one hundred one thousand, three".