221200120221 has 16 divisors (see below), whose sum is σ = 299110169088. Its totient is φ = 145378724400.

The previous prime is 221200120151. The next prime is 221200120241. The reversal of 221200120221 is 122021002122.

It is not a de Polignac number, because 221200120221 - 2⁷ = 221200120093 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221200120221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221200120241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3536106 + ... + 3598116.

It is an arithmetic number, because the mean of its divisors is an integer number (18694385568).

Almost surely, 2^221200120221 is an apocalyptic number.

It is an amenable number.

221200120221 is a deficient number, since it is larger than the sum of its proper divisors (77910048867).

221200120221 is a wasteful number, since it uses less digits than its factorization.

221200120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78832.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 221200120221 its reverse (122021002122), we get a palindrome (343221122343).

The spelling of 221200120221 in words is "two hundred twenty-one billion, two hundred million, one hundred twenty thousand, two hundred twenty-one".