21212102201211 has 12 divisors (see below), whose sum is σ = 31387013013720. Its totient is φ = 13796489236320.

The previous prime is 21212102201209. The next prime is 21212102201281. The reversal of 21212102201211 is 11210220121212.

21212102201211 is a `hidden beast` number, since 2 + 1 + 21 + 210 + 220 + 1 + 211 = 666.

It is not a de Polignac number, because 21212102201211 - 2¹ = 21212102201209 is a prime.

It is a super-3 number, since 3×21212102201211³ (a number of 41 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21212102201201) 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, 28742685541 + ... + 28742686278.

It is an arithmetic number, because the mean of its divisors is an integer number (2615584417810).

Almost surely, 2^{21212102201211} is an apocalyptic number.

21212102201211 is a deficient number, since it is larger than the sum of its proper divisors (10174910812509).

21212102201211 is a wasteful number, since it uses less digits than its factorization.

21212102201211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57485371866 (or 57485371863 counting only the distinct ones).

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

Adding to 21212102201211 its reverse (11210220121212), we get a palindrome (32422322322423).

The spelling of 21212102201211 in words is "twenty-one trillion, two hundred twelve billion, one hundred two million, two hundred one thousand, two hundred eleven".