21121220130121 has 16 divisors (see below), whose sum is σ = 21657587390208. Its totient is φ = 20588484960000.

The previous prime is 21121220130119. The next prime is 21121220130209. The reversal of 21121220130121 is 12103102212112.

It is a cyclic number.

It is not a de Polignac number, because 21121220130121 - 2¹ = 21121220130119 is a prime.

It is a super-2 number, since 2×21121220130121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21131220130121) 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 15 ways as a sum of consecutive naturals, for example, 415476721 + ... + 415527553.

It is an arithmetic number, because the mean of its divisors is an integer number (1353599211888).

Almost surely, 2^{21121220130121} is an apocalyptic number.

It is an amenable number.

21121220130121 is a deficient number, since it is larger than the sum of its proper divisors (536367260087).

21121220130121 is a wasteful number, since it uses less digits than its factorization.

21121220130121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86352.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 21121220130121 its reverse (12103102212112), we get a palindrome (33224322342233).

The spelling of 21121220130121 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred twenty million, one hundred thirty thousand, one hundred twenty-one".