221200222120221 has 16 divisors (see below), whose sum is σ = 296915798836800. Its totient is φ = 146475748402560.

The previous prime is 221200222120183. The next prime is 221200222120237. The reversal of 221200222120221 is 122021222002122.

It is not a de Polignac number, because 221200222120221 - 2¹¹ = 221200222118173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221200222120321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47238906 + ... + 51709908.

It is an arithmetic number, because the mean of its divisors is an integer number (18557237427300).

Almost surely, 2^{221200222120221} is an apocalyptic number.

It is an amenable number.

221200222120221 is a deficient number, since it is larger than the sum of its proper divisors (75715576716579).

221200222120221 is a wasteful number, since it uses less digits than its factorization.

221200222120221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4581836.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 221200222120221 its reverse (122021222002122), we get a palindrome (343221444122343).

The spelling of 221200222120221 in words is "two hundred twenty-one trillion, two hundred billion, two hundred twenty-two million, one hundred twenty thousand, two hundred twenty-one".