21212112022011 has 16 divisors (see below), whose sum is σ = 31425506121600. Its totient is φ = 14141338274664.

The previous prime is 21212112022007. The next prime is 21212112022043. The reversal of 21212112022011 is 11022021121212.

21212112022011 is a `hidden beast` number, since 212 + 1 + 211 + 20 + 220 + 1 + 1 = 666.

It is not a de Polignac number, because 21212112022011 - 2² = 21212112022007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21212112022081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3966120 + ... + 7625898.

It is an arithmetic number, because the mean of its divisors is an integer number (1964094132600).

Almost surely, 2^{21212112022011} is an apocalyptic number.

21212112022011 is a deficient number, since it is larger than the sum of its proper divisors (10213394099589).

21212112022011 is a wasteful number, since it uses less digits than its factorization.

21212112022011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3874455 (or 3874449 counting only the distinct ones).

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

Adding to 21212112022011 its reverse (11022021121212), we get a palindrome (32234133143223).

The spelling of 21212112022011 in words is "twenty-one trillion, two hundred twelve billion, one hundred twelve million, twenty-two thousand, eleven".