21212212100012 has 24 divisors (see below), whose sum is σ = 38319027234432. Its totient is φ = 10263922041600.

The previous prime is 21212212099843. The next prime is 21212212100021. The reversal of 21212212100012 is 21000121221212.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38586308 + ... + 39132180.

It is an arithmetic number, because the mean of its divisors is an integer number (1596626134768).

Almost surely, 2^{21212212100012} is an apocalyptic number.

It is an amenable number.

21212212100012 is a deficient number, since it is larger than the sum of its proper divisors (17106815134420).

21212212100012 is a wasteful number, since it uses less digits than its factorization.

21212212100012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 859289 (or 859287 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21212212100012 its reverse (21000121221212), we get a palindrome (42212333321224).

The spelling of 21212212100012 in words is "twenty-one trillion, two hundred twelve billion, two hundred twelve million, one hundred thousand, twelve".