21122012120121 has 12 divisors (see below), whose sum is σ = 33283170613680. Its totient is φ = 12801219466680.

The previous prime is 21122012120119. The next prime is 21122012120129. The reversal of 21122012120121 is 12102121022112.

21122012120121 is a `hidden beast` number, since 211 + 220 + 1 + 212 + 0 + 1 + 21 = 666.

It is not a de Polignac number, because 21122012120121 - 2¹ = 21122012120119 is a prime.

It is a super-2 number, since 2×21122012120121² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21122012120094 and 21122012120103.

It is not an unprimeable number, because it can be changed into a prime (21122012120129) 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, 106676828791 + ... + 106676828988.

It is an arithmetic number, because the mean of its divisors is an integer number (2773597551140).

Almost surely, 2^{21122012120121} is an apocalyptic number.

It is an amenable number.

21122012120121 is a deficient number, since it is larger than the sum of its proper divisors (12161158493559).

21122012120121 is a wasteful number, since it uses less digits than its factorization.

21122012120121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213353657796 (or 213353657793 counting only the distinct ones).

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

Adding to 21122012120121 its reverse (12102121022112), we get a palindrome (33224133142233).

The spelling of 21122012120121 in words is "twenty-one trillion, one hundred twenty-two billion, twelve million, one hundred twenty thousand, one hundred twenty-one".