221011110021 has 32 divisors (see below), whose sum is σ = 324161349120. Its totient is φ = 133088454144.

The previous prime is 221011109989. The next prime is 221011110029. The reversal of 221011110021 is 120011110122.

221011110021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221011110021 - 2⁵ = 221011109989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221011109979 and 221011110006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221011110029) 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 31 ways as a sum of consecutive naturals, for example, 16873551 + ... + 16886643.

It is an arithmetic number, because the mean of its divisors is an integer number (10130042160).

Almost surely, 2^221011110021 is an apocalyptic number.

It is an amenable number.

221011110021 is a deficient number, since it is larger than the sum of its proper divisors (103150239099).

221011110021 is a wasteful number, since it uses less digits than its factorization.

221011110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22365.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 221011110021 its reverse (120011110122), we get a palindrome (341022220143).

The spelling of 221011110021 in words is "two hundred twenty-one billion, eleven million, one hundred ten thousand, twenty-one".