221000011221 has 16 divisors (see below), whose sum is σ = 321470664768. Its totient is φ = 133932691200.

The previous prime is 221000011201. The next prime is 221000011259. The reversal of 221000011221 is 122110000122.

221000011221 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 221000011221 - 2²³ = 220991622613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221000011197 and 221000011206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221000011201) 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, 546381 + ... + 860541.

It is an arithmetic number, because the mean of its divisors is an integer number (20091916548).

Almost surely, 2^221000011221 is an apocalyptic number.

It is an amenable number.

221000011221 is a deficient number, since it is larger than the sum of its proper divisors (100470653547).

221000011221 is a wasteful number, since it uses less digits than its factorization.

221000011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335492.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 221000011221 its reverse (122110000122), we get a palindrome (343110011343).

The spelling of 221000011221 in words is "two hundred twenty-one billion, eleven thousand, two hundred twenty-one".