221100110120021 has 16 divisors (see below), whose sum is σ = 246816338079168. Its totient is φ = 196320180336000.

The previous prime is 221100110119943. The next prime is 221100110120101. The reversal of 221100110120021 is 120021011001122.

It is a cyclic number.

It is not a de Polignac number, because 221100110120021 - 2²² = 221100105925717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221100110119978 and 221100110120005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221100110120621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10405535 + ... + 23462211.

It is an arithmetic number, because the mean of its divisors is an integer number (15426021129948).

Almost surely, 2^{221100110120021} is an apocalyptic number.

It is an amenable number.

221100110120021 is a deficient number, since it is larger than the sum of its proper divisors (25716227959147).

221100110120021 is a wasteful number, since it uses less digits than its factorization.

221100110120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13092532.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 221100110120021 its reverse (120021011001122), we get a palindrome (341121121121143).

The spelling of 221100110120021 in words is "two hundred twenty-one trillion, one hundred billion, one hundred ten million, one hundred twenty thousand, twenty-one".