21000200212 has 6 divisors (see below), whose sum is σ = 36750350378. Its totient is φ = 10500100104.

The previous prime is 21000200153. The next prime is 21000200251. The reversal of 21000200212 is 21200200012.

It can be written as a sum of positive squares in only one way, i.e., 19067191056 + 1933009156 = 138084^2 + 43966^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2625025023 + ... + 2625025030.

Almost surely, 2^21000200212 is an apocalyptic number.

It is an amenable number.

21000200212 is a deficient number, since it is larger than the sum of its proper divisors (15750150166).

21000200212 is a wasteful number, since it uses less digits than its factorization.

21000200212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5250050057 (or 5250050055 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 21000200212 its reverse (21200200012), we get a palindrome (42200400224).

The spelling of 21000200212 in words is "twenty-one billion, two hundred thousand, two hundred twelve".