21001333103 has 2 divisors, whose sum is σ = 21001333104. Its totient is φ = 21001333102.

The previous prime is 21001333049. The next prime is 21001333123. The reversal of 21001333103 is 30133310012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21001333103 - 2⁶ = 21001333039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21001333123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500666551 + 10500666552.

It is an arithmetic number, because the mean of its divisors is an integer number (10500666552).

Almost surely, 2^21001333103 is an apocalyptic number.

21001333103 is a deficient number, since it is larger than the sum of its proper divisors (1).

21001333103 is an equidigital number, since it uses as much as digits as its factorization.

21001333103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 17.

Adding to 21001333103 its reverse (30133310012), we get a palindrome (51134643115).

The spelling of 21001333103 in words is "twenty-one billion, one million, three hundred thirty-three thousand, one hundred three".