21202210121121 has 16 divisors (see below), whose sum is σ = 31542107116800. Its totient is φ = 14075665292304.

The previous prime is 21202210121083. The next prime is 21202210121129. The reversal of 21202210121121 is 12112101220212.

21202210121121 is a `hidden beast` number, since 21 + 202 + 210 + 1 + 211 + 21 = 666.

It is not a de Polignac number, because 21202210121121 - 2¹⁰ = 21202210120097 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21202210121094 and 21202210121103.

It is not an unprimeable number, because it can be changed into a prime (21202210121129) 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, 1642811626 + ... + 1642824531.

It is an arithmetic number, because the mean of its divisors is an integer number (1971381694800).

Almost surely, 2^{21202210121121} is an apocalyptic number.

It is an amenable number.

21202210121121 is a deficient number, since it is larger than the sum of its proper divisors (10339896995679).

21202210121121 is a wasteful number, since it uses less digits than its factorization.

21202210121121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3285636405 (or 3285636399 counting only the distinct ones).

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

Adding to 21202210121121 its reverse (12112101220212), we get a palindrome (33314311341333).

The spelling of 21202210121121 in words is "twenty-one trillion, two hundred two billion, two hundred ten million, one hundred twenty-one thousand, one hundred twenty-one".