21212000110121 has 32 divisors (see below), whose sum is σ = 21963239424000. Its totient is φ = 20479424853888.

The previous prime is 21212000110117. The next prime is 21212000110141. The reversal of 21212000110121 is 12101100021212.

It is a cyclic number.

It is not a de Polignac number, because 21212000110121 - 2² = 21212000110117 is a prime.

It is a super-2 number, since 2×21212000110121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21212000110096 and 21212000110105.

It is not an unprimeable number, because it can be changed into a prime (21212000110141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 228928520 + ... + 229021158.

It is an arithmetic number, because the mean of its divisors is an integer number (686351232000).

Almost surely, 2^{21212000110121} is an apocalyptic number.

It is an amenable number.

21212000110121 is a deficient number, since it is larger than the sum of its proper divisors (751239313879).

21212000110121 is a wasteful number, since it uses less digits than its factorization.

21212000110121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93173.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21212000110121 its reverse (12101100021212), we get a palindrome (33313100131333).

The spelling of 21212000110121 in words is "twenty-one trillion, two hundred twelve billion, one hundred ten thousand, one hundred twenty-one".