21201120221121 has 12 divisors (see below), whose sum is σ = 30992802252048. Its totient is φ = 13963790024664.

The previous prime is 21201120221089. The next prime is 21201120221153. The reversal of 21201120221121 is 12112202110212.

21201120221121 is a `hidden beast` number, since 2 + 1 + 201 + 120 + 221 + 121 = 666.

It is an interprime number because it is at equal distance from previous prime (21201120221089) and next prime (21201120221153).

It is not a de Polignac number, because 21201120221121 - 2⁵ = 21201120221089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21201120221094 and 21201120221103.

It is not an unprimeable number, because it can be changed into a prime (21201120223121) 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, 14190842775 + ... + 14190844268.

It is an arithmetic number, because the mean of its divisors is an integer number (2582733521004).

Almost surely, 2^{21201120221121} is an apocalyptic number.

It is an amenable number.

21201120221121 is a deficient number, since it is larger than the sum of its proper divisors (9791682030927).

21201120221121 is a wasteful number, since it uses less digits than its factorization.

21201120221121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28381687132 (or 28381687129 counting only the distinct ones).

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

Adding to 21201120221121 its reverse (12112202110212), we get a palindrome (33313322331333).

The spelling of 21201120221121 in words is "twenty-one trillion, two hundred one billion, one hundred twenty million, two hundred twenty-one thousand, one hundred twenty-one".