21212011222012 has 24 divisors (see below), whose sum is σ = 41354982093600. Its totient is φ = 9452567334336.

The previous prime is 21212011221991. The next prime is 21212011222049. The reversal of 21212011222012 is 21022211021212.

It is a congruent number.

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, 7033158712 + ... + 7033161727.

It is an arithmetic number, because the mean of its divisors is an integer number (1723124253900).

Almost surely, 2^{21212011222012} is an apocalyptic number.

It is an amenable number.

21212011222012 is a deficient number, since it is larger than the sum of its proper divisors (20142970871588).

21212011222012 is a wasteful number, since it uses less digits than its factorization.

21212011222012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14066320485 (or 14066320483 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21212011222012 its reverse (21022211021212), we get a palindrome (42234222243224).

The spelling of 21212011222012 in words is "twenty-one trillion, two hundred twelve billion, eleven million, two hundred twenty-two thousand, twelve".