221121220112 has 40 divisors (see below), whose sum is σ = 461471963904. Its totient is φ = 102035147904.

The previous prime is 221121220109. The next prime is 221121220147. The reversal of 221121220112 is 211022121122.

221121220112 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 938963 + ... + 1150605.

Almost surely, 2^221121220112 is an apocalyptic number.

It is an amenable number.

221121220112 is an abundant number, since it is smaller than the sum of its proper divisors (240350743792).

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

221121220112 is a wasteful number, since it uses less digits than its factorization.

221121220112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216687 (or 216681 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221121220112 its reverse (211022121122), we get a palindrome (432143341234).

The spelling of 221121220112 in words is "two hundred twenty-one billion, one hundred twenty-one million, two hundred twenty thousand, one hundred twelve".