21220100121121 has 16 divisors (see below), whose sum is σ = 23204479795200. Its totient is φ = 19244984626000.

The previous prime is 21220100121119. The next prime is 21220100121191. The reversal of 21220100121121 is 12112100102212.

It is a cyclic number.

It is not a de Polignac number, because 21220100121121 - 2¹ = 21220100121119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21220100121095 and 21220100121104.

It is not an unprimeable number, because it can be changed into a prime (21220100121191) 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, 7071960 + ... + 9615238.

It is an arithmetic number, because the mean of its divisors is an integer number (1450279987200).

Almost surely, 2^{21220100121121} is an apocalyptic number.

It is an amenable number.

21220100121121 is a deficient number, since it is larger than the sum of its proper divisors (1984379674079).

21220100121121 is a wasteful number, since it uses less digits than its factorization.

21220100121121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2545100.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21220100121121 its reverse (12112100102212), we get a palindrome (33332200223333).

The spelling of 21220100121121 in words is "twenty-one trillion, two hundred twenty billion, one hundred million, one hundred twenty-one thousand, one hundred twenty-one".