21013321003 has 2 divisors, whose sum is σ = 21013321004. Its totient is φ = 21013321002.

The previous prime is 21013320893. The next prime is 21013321027. The reversal of 21013321003 is 30012331012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21013321003 - 2²¹ = 21011223851 is a prime.

It is not a weakly prime, because it can be changed into another prime (21013321093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506660501 + 10506660502.

It is an arithmetic number, because the mean of its divisors is an integer number (10506660502).

Almost surely, 2^21013321003 is an apocalyptic number.

21013321003 is a deficient number, since it is larger than the sum of its proper divisors (1).

21013321003 is an equidigital number, since it uses as much as digits as its factorization.

21013321003 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21013321003 its reverse (30012331012), we get a palindrome (51025652015).

The spelling of 21013321003 in words is "twenty-one billion, thirteen million, three hundred twenty-one thousand, three".