21203000212 has 12 divisors (see below), whose sum is σ = 37222303860. Its totient is φ = 10568056256.

The previous prime is 21203000197. The next prime is 21203000237. The reversal of 21203000212 is 21200030212.

It can be written as a sum of positive squares in 2 ways, for example, as 6318024196 + 14884976016 = 79486^2 + 122004^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21203000192 and 21203000201.

It is a congruent number.

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, 8359537 + ... + 8362072.

It is an arithmetic number, because the mean of its divisors is an integer number (3101858655).

Almost surely, 2^21203000212 is an apocalyptic number.

It is an amenable number.

21203000212 is a deficient number, since it is larger than the sum of its proper divisors (16019303648).

21203000212 is a wasteful number, since it uses less digits than its factorization.

21203000212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16721930 (or 16721928 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 21203000212 its reverse (21200030212), we get a palindrome (42403030424).

The spelling of 21203000212 in words is "twenty-one billion, two hundred three million, two hundred twelve", and thus it is an aban number.