221220102211 has 4 divisors (see below), whose sum is σ = 221697899872. Its totient is φ = 220742304552.

The previous prime is 221220102167. The next prime is 221220102217. The reversal of 221220102211 is 112201022122.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221220102211 - 2¹⁹ = 221219577923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221220102217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 238898136 + ... + 238899061.

It is an arithmetic number, because the mean of its divisors is an integer number (55424474968).

Almost surely, 2^221220102211 is an apocalyptic number.

221220102211 is a deficient number, since it is larger than the sum of its proper divisors (477797661).

221220102211 is an equidigital number, since it uses as much as digits as its factorization.

221220102211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477797660.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 221220102211 its reverse (112201022122), we get a palindrome (333421124333).

The spelling of 221220102211 in words is "two hundred twenty-one billion, two hundred twenty million, one hundred two thousand, two hundred eleven".