21121020330121 has 16 divisors (see below), whose sum is σ = 21356662174848. Its totient is φ = 20885988384000.

The previous prime is 21121020330037. The next prime is 21121020330133. The reversal of 21121020330121 is 12103302012112.

It is a cyclic number.

It is not a de Polignac number, because 21121020330121 - 2³⁵ = 21086660591753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21121020337121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 203353615 + ... + 203457451.

It is an arithmetic number, because the mean of its divisors is an integer number (1334791385928).

Almost surely, 2^{21121020330121} is an apocalyptic number.

It is an amenable number.

21121020330121 is a deficient number, since it is larger than the sum of its proper divisors (235641844727).

21121020330121 is a wasteful number, since it uses less digits than its factorization.

21121020330121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106752.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21121020330121 its reverse (12103302012112), we get a palindrome (33224322342233).

The spelling of 21121020330121 in words is "twenty-one trillion, one hundred twenty-one billion, twenty million, three hundred thirty thousand, one hundred twenty-one".