21033312003 has 24 divisors (see below), whose sum is σ = 33148917360. Its totient is φ = 12745340160.

The previous prime is 21033311993. The next prime is 21033312011. The reversal of 21033312003 is 30021333012.

21033312003 is a `hidden beast` number, since 210 + 333 + 120 + 0 + 3 = 666.

It is not a de Polignac number, because 21033312003 - 2⁶ = 21033311939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21033312023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 745783 + ... + 773471.

It is an arithmetic number, because the mean of its divisors is an integer number (1381204890).

Almost surely, 2^21033312003 is an apocalyptic number.

21033312003 is a deficient number, since it is larger than the sum of its proper divisors (12115605357).

21033312003 is a wasteful number, since it uses less digits than its factorization.

21033312003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35379 (or 35376 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

Adding to 21033312003 its reverse (30021333012), we get a palindrome (51054645015).

The spelling of 21033312003 in words is "twenty-one billion, thirty-three million, three hundred twelve thousand, three".