21023110121121 has 96 divisors (see below), whose sum is σ = 33503787233280. Its totient is φ = 12657824121600.

The previous prime is 21023110121119. The next prime is 21023110121141. The reversal of 21023110121121 is 12112101132012.

It is a happy number.

21023110121121 is a `hidden beast` number, since 210 + 2 + 311 + 0 + 1 + 21 + 121 = 666.

It is not a de Polignac number, because 21023110121121 - 2¹ = 21023110121119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21023110121094 and 21023110121103.

It is not an unprimeable number, because it can be changed into a prime (21023110121141) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 47140101 + ... + 47583981.

It is an arithmetic number, because the mean of its divisors is an integer number (348997783680).

Almost surely, 2^{21023110121121} is an apocalyptic number.

It is an amenable number.

21023110121121 is a deficient number, since it is larger than the sum of its proper divisors (12480677112159).

21023110121121 is a wasteful number, since it uses less digits than its factorization.

21023110121121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444107 (or 444104 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 21023110121121 its reverse (12112101132012), we get a palindrome (33135211253133).

The spelling of 21023110121121 in words is "twenty-one trillion, twenty-three billion, one hundred ten million, one hundred twenty-one thousand, one hundred twenty-one".