221221212010211 has 16 divisors (see below), whose sum is σ = 253270483361280. Its totient is φ = 189283793115840.

The previous prime is 221221212010207. The next prime is 221221212010217. The reversal of 221221212010211 is 112010212122122.

It is a cyclic number.

It is not a de Polignac number, because 221221212010211 - 2² = 221221212010207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221221212010217) 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, 3087266 + ... + 21259671.

It is an arithmetic number, because the mean of its divisors is an integer number (15829405210080).

Almost surely, 2^{221221212010211} is an apocalyptic number.

221221212010211 is a deficient number, since it is larger than the sum of its proper divisors (32049271351069).

221221212010211 is a wasteful number, since it uses less digits than its factorization.

221221212010211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24349234.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 221221212010211 its reverse (112010212122122), we get a palindrome (333231424132333).

The spelling of 221221212010211 in words is "two hundred twenty-one trillion, two hundred twenty-one billion, two hundred twelve million, ten thousand, two hundred eleven".