21203430212 has 12 divisors (see below), whose sum is σ = 37167137280. Its totient is φ = 10584248136.

The previous prime is 21203430203. The next prime is 21203430223.

21203430212 is nontrivially palindromic in base 10.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 4364012 + ... + 4368867.

It is an arithmetic number, because the mean of its divisors is an integer number (3097261440).

Almost surely, 2^21203430212 is an apocalyptic number.

It is an amenable number.

21203430212 is a deficient number, since it is larger than the sum of its proper divisors (15963707068).

21203430212 is a wasteful number, since it uses less digits than its factorization.

21203430212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8733490 (or 8733488 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The spelling of 21203430212 in words is "twenty-one billion, two hundred three million, four hundred thirty thousand, two hundred twelve".