221020121112 has 64 divisors (see below), whose sum is σ = 632132881920. Its totient is φ = 63083923968.

The previous prime is 221020121111. The next prime is 221020121117. The reversal of 221020121112 is 211121020122.

221020121112 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 221020121091 and 221020121100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221020121111) 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, 509148 + ... + 837419.

It is an arithmetic number, because the mean of its divisors is an integer number (9877076280).

Almost surely, 2^221020121112 is an apocalyptic number.

It is an amenable number.

221020121112 is an abundant number, since it is smaller than the sum of its proper divisors (411112760808).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221020121112 is a wasteful number, since it uses less digits than its factorization.

221020121112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1347560 (or 1347556 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 221020121112 its reverse (211121020122), we get a palindrome (432141141234).

The spelling of 221020121112 in words is "two hundred twenty-one billion, twenty million, one hundred twenty-one thousand, one hundred twelve".