21311012003 has 2 divisors, whose sum is σ = 21311012004. Its totient is φ = 21311012002.

The previous prime is 21311011993. The next prime is 21311012057. The reversal of 21311012003 is 30021011312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21311012003 - 2¹⁰ = 21311010979 is a prime.

It is not a weakly prime, because it can be changed into another prime (21311012603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10655506001 + 10655506002.

It is an arithmetic number, because the mean of its divisors is an integer number (10655506002).

Almost surely, 2^21311012003 is an apocalyptic number.

21311012003 is a deficient number, since it is larger than the sum of its proper divisors (1).

21311012003 is an equidigital number, since it uses as much as digits as its factorization.

21311012003 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 21311012003 its reverse (30021011312), we get a palindrome (51332023315).

The spelling of 21311012003 in words is "twenty-one billion, three hundred eleven million, twelve thousand, three".