21212102111101 has 16 divisors (see below), whose sum is σ = 23355611596800. Its totient is φ = 19105027988400.

The previous prime is 21212102111099. The next prime is 21212102111141. The reversal of 21212102111101 is 10111120121212.

It is a cyclic number.

It is not a de Polignac number, because 21212102111101 - 2¹ = 21212102111099 is a prime.

It is a super-3 number, since 3×21212102111101³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212102111141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13749015 + ... + 15213796.

It is an arithmetic number, because the mean of its divisors is an integer number (1459725724800).

Almost surely, 2^{21212102111101} is an apocalyptic number.

It is an amenable number.

21212102111101 is a deficient number, since it is larger than the sum of its proper divisors (2143509485699).

21212102111101 is a wasteful number, since it uses less digits than its factorization.

21212102111101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28963440.

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 21212102111101 its reverse (10111120121212), we get a palindrome (31323222232313).

The spelling of 21212102111101 in words is "twenty-one trillion, two hundred twelve billion, one hundred two million, one hundred eleven thousand, one hundred one".