21010110121121 has 16 divisors (see below), whose sum is σ = 22953695925888. Its totient is φ = 19072122384000.

The previous prime is 21010110121057. The next prime is 21010110121159. The reversal of 21010110121121 is 12112101101012.

It is a cyclic number.

It is not a de Polignac number, because 21010110121121 - 2⁶ = 21010110121057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21010110121096 and 21010110121105.

It is not an unprimeable number, because it can be changed into a prime (21010110121321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 399534596 + ... + 399587178.

It is an arithmetic number, because the mean of its divisors is an integer number (1434605995368).

Almost surely, 2^{21010110121121} is an apocalyptic number.

It is an amenable number.

21010110121121 is a deficient number, since it is larger than the sum of its proper divisors (1943585804767).

21010110121121 is a wasteful number, since it uses less digits than its factorization.

21010110121121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105112.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 21010110121121 its reverse (12112101101012), we get a palindrome (33122211222133).

The spelling of 21010110121121 in words is "twenty-one trillion, ten billion, one hundred ten million, one hundred twenty-one thousand, one hundred twenty-one".