21003230212 has 12 divisors (see below), whose sum is σ = 36808090956. Its totient is φ = 10486632800.

The previous prime is 21003230207. The next prime is 21003230219. The reversal of 21003230212 is 21203230012.

It can be written as a sum of positive squares in 2 ways, for example, as 14523624196 + 6479606016 = 120514^2 + 80496^2 .

It is a super-2 number, since 2×21003230212² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21003230219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3742423 + ... + 3748030.

It is an arithmetic number, because the mean of its divisors is an integer number (3067340913).

Almost surely, 2^21003230212 is an apocalyptic number.

It is an amenable number.

21003230212 is a deficient number, since it is larger than the sum of its proper divisors (15804860744).

21003230212 is a wasteful number, since it uses less digits than its factorization.

21003230212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7491158 (or 7491156 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21003230212 its reverse (21203230012), we get a palindrome (42206460224).

The spelling of 21003230212 in words is "twenty-one billion, three million, two hundred thirty thousand, two hundred twelve".