21221102101121 has 16 divisors (see below), whose sum is σ = 22972419313536. Its totient is φ = 19486778674176.

The previous prime is 21221102101079. The next prime is 21221102101189. The reversal of 21221102101121 is 12110120112212.

It is a cyclic number.

It is not a de Polignac number, because 21221102101121 - 2¹⁰ = 21221102100097 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21221102101121.

It is not an unprimeable number, because it can be changed into a prime (21221102109121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 183257186 + ... + 183372948.

It is an arithmetic number, because the mean of its divisors is an integer number (1435776207096).

Almost surely, 2^{21221102101121} is an apocalyptic number.

It is an amenable number.

21221102101121 is a deficient number, since it is larger than the sum of its proper divisors (1751317212415).

21221102101121 is a wasteful number, since it uses less digits than its factorization.

21221102101121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189032.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21221102101121 its reverse (12110120112212), we get a palindrome (33331222213333).

The spelling of 21221102101121 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred two million, one hundred one thousand, one hundred twenty-one".