21303003212 has 24 divisors (see below), whose sum is σ = 40746545280. Its totient is φ = 9701556480.

The previous prime is 21303003199. The next prime is 21303003217. The reversal of 21303003212 is 21230030312.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is not an unprimeable number, because it can be changed into a prime (21303003217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5050787 + ... + 5055002.

It is an arithmetic number, because the mean of its divisors is an integer number (1697772720).

Almost surely, 2^21303003212 is an apocalyptic number.

It is an amenable number.

21303003212 is a deficient number, since it is larger than the sum of its proper divisors (19443542068).

21303003212 is a wasteful number, since it uses less digits than its factorization.

21303003212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10105841 (or 10105839 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 21303003212 its reverse (21230030312), we get a palindrome (42533033524).

The spelling of 21303003212 in words is "twenty-one billion, three hundred three million, three thousand, two hundred twelve".