21110202221121 has 16 divisors (see below), whose sum is σ = 33680094712320. Its totient is φ = 12990893674320.

The previous prime is 21110202221099. The next prime is 21110202221167. The reversal of 21110202221121 is 12112220201112.

21110202221121 is a `hidden beast` number, since 211 + 10 + 202 + 221 + 1 + 21 = 666.

It is not a de Polignac number, because 21110202221121 - 2⁷ = 21110202220993 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21110202221094 and 21110202221103.

It is not an unprimeable number, because it can be changed into a prime (21110202211121) 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, 30071512785 + ... + 30071513486.

It is an arithmetic number, because the mean of its divisors is an integer number (2105005919520).

Almost surely, 2^{21110202221121} is an apocalyptic number.

It is an amenable number.

21110202221121 is a deficient number, since it is larger than the sum of its proper divisors (12569892491199).

21110202221121 is a wasteful number, since it uses less digits than its factorization.

21110202221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60143026293 (or 60143026287 counting only the distinct ones).

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

Adding to 21110202221121 its reverse (12112220201112), we get a palindrome (33222422422233).

The spelling of 21110202221121 in words is "twenty-one trillion, one hundred ten billion, two hundred two million, two hundred twenty-one thousand, one hundred twenty-one".