21212212012011 has 12 divisors (see below), whose sum is σ = 30709656474640. Its totient is φ = 14109261745680.

The previous prime is 21212212011997. The next prime is 21212212012039. The reversal of 21212212012011 is 11021021221212.

21212212012011 is a `hidden beast` number, since 21 + 21 + 221 + 201 + 201 + 1 = 666.

It is not a de Polignac number, because 21212212012011 - 2¹⁰ = 21212212010987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21212212013011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2684406580 + ... + 2684414481.

Almost surely, 2^{21212212012011} is an apocalyptic number.

21212212012011 is a deficient number, since it is larger than the sum of its proper divisors (9497444462629).

21212212012011 is a wasteful number, since it uses less digits than its factorization.

21212212012011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5368821506 (or 5368821503 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21212212012011 its reverse (11021021221212), we get a palindrome (32233233233223).

The spelling of 21212212012011 in words is "twenty-one trillion, two hundred twelve billion, two hundred twelve million, twelve thousand, eleven".