21312003212003 has 64 divisors (see below), whose sum is σ = 25256746045440. Its totient is φ = 17607048496128.

The previous prime is 21312003211931. The next prime is 21312003212021. The reversal of 21312003212003 is 30021230021312.

It is a de Polignac number, because none of the positive numbers 2^k-21312003212003 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21312003212023) 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 in 63 ways as a sum of consecutive naturals, for example, 5898698225 + ... + 5898701837.

It is an arithmetic number, because the mean of its divisors is an integer number (394636656960).

Almost surely, 2^{21312003212003} is an apocalyptic number.

21312003212003 is a deficient number, since it is larger than the sum of its proper divisors (3944742833437).

21312003212003 is a wasteful number, since it uses less digits than its factorization.

21312003212003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4708.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21312003212003 its reverse (30021230021312), we get a palindrome (51333233233315).

The spelling of 21312003212003 in words is "twenty-one trillion, three hundred twelve billion, three million, two hundred twelve thousand, three".