21212211202101 has 48 divisors (see below), whose sum is σ = 31026013200000. Its totient is φ = 13963691174400.

The previous prime is 21212211202099. The next prime is 21212211202111. The reversal of 21212211202101 is 10120211221212.

21212211202101 is a `hidden beast` number, since 212 + 1 + 221 + 1 + 20 + 210 + 1 = 666.

It is not a de Polignac number, because 21212211202101 - 2¹ = 21212211202099 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212211202111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4160070250 + ... + 4160075348.

It is an arithmetic number, because the mean of its divisors is an integer number (646375275000).

Almost surely, 2^{21212211202101} is an apocalyptic number.

It is an amenable number.

21212211202101 is a deficient number, since it is larger than the sum of its proper divisors (9813801997899).

21212211202101 is a wasteful number, since it uses less digits than its factorization.

21212211202101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11194 (or 11191 counting only the distinct ones).

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

Adding to 21212211202101 its reverse (10120211221212), we get a palindrome (31332422423313).

The spelling of 21212211202101 in words is "twenty-one trillion, two hundred twelve billion, two hundred eleven million, two hundred two thousand, one hundred one".