21010221212 has 12 divisors (see below), whose sum is σ = 36769774440. Its totient is φ = 10504571376.

The previous prime is 21010221209. The next prime is 21010221227. The reversal of 21010221212 is 21212201012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39683 + ... + 208794.

It is an arithmetic number, because the mean of its divisors is an integer number (3064147870).

Almost surely, 2^21010221212 is an apocalyptic number.

It is an amenable number.

21010221212 is a deficient number, since it is larger than the sum of its proper divisors (15759553228).

21010221212 is a wasteful number, since it uses less digits than its factorization.

21010221212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269620 (or 269618 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21010221212 its reverse (21212201012), we get a palindrome (42222422224).

The spelling of 21010221212 in words is "twenty-one billion, ten million, two hundred twenty-one thousand, two hundred twelve".