21200010212 has 6 divisors (see below), whose sum is σ = 37100017878. Its totient is φ = 10600005104.

The previous prime is 21200010197. The next prime is 21200010233. The reversal of 21200010212 is 21201000212.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18272550976 + 2927459236 = 135176^2 + 54106^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21200010193 and 21200010202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2650001273 + ... + 2650001280.

It is an arithmetic number, because the mean of its divisors is an integer number (6183336313).

Almost surely, 2^21200010212 is an apocalyptic number.

It is an amenable number.

21200010212 is a deficient number, since it is larger than the sum of its proper divisors (15900007666).

21200010212 is a wasteful number, since it uses less digits than its factorization.

21200010212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5300002557 (or 5300002555 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21200010212 its reverse (21201000212), we get a palindrome (42401010424).

The spelling of 21200010212 in words is "twenty-one billion, two hundred million, ten thousand, two hundred twelve".