221120112121021 has 8 divisors (see below), whose sum is σ = 228745341559800. Its totient is φ = 213494909214720.

The previous prime is 221120112121009. The next prime is 221120112121121. The reversal of 221120112121021 is 120121211021122.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 10052268121 + 221110059852900 = 100261^2 + 14869770^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221120112121021 - 2³⁵ = 221085752382653 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 221120112121021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221120112121121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11128285 + ... + 23792413.

It is an arithmetic number, because the mean of its divisors is an integer number (28593167694975).

Almost surely, 2^{221120112121021} is an apocalyptic number.

It is an amenable number.

221120112121021 is a deficient number, since it is larger than the sum of its proper divisors (7625229438779).

221120112121021 is a wasteful number, since it uses less digits than its factorization.

221120112121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13266239.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 221120112121021 its reverse (120121211021122), we get a palindrome (341241323142143).

The spelling of 221120112121021 in words is "two hundred twenty-one trillion, one hundred twenty billion, one hundred twelve million, one hundred twenty-one thousand, twenty-one".