21303213003 has 16 divisors (see below), whose sum is σ = 33221385600. Its totient is φ = 13454660520.

The previous prime is 21303212971. The next prime is 21303213007. The reversal of 21303213003 is 30031230312.

It is not a de Polignac number, because 21303213003 - 2⁵ = 21303212971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21303213007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20762853 + ... + 20763878.

It is an arithmetic number, because the mean of its divisors is an integer number (2076336600).

Almost surely, 2^21303213003 is an apocalyptic number.

21303213003 is a deficient number, since it is larger than the sum of its proper divisors (11918172597).

21303213003 is a wasteful number, since it uses less digits than its factorization.

21303213003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41526759 (or 41526753 counting only the distinct ones).

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

Adding to 21303213003 its reverse (30031230312), we get a palindrome (51334443315).

The spelling of 21303213003 in words is "twenty-one billion, three hundred three million, two hundred thirteen thousand, three".