221220212211 has 10 divisors (see below), whose sum is σ = 330464761572. Its totient is φ = 147480141420.

The previous prime is 221220212201. The next prime is 221220212219. The reversal of 221220212211 is 112212022122.

It is a happy number.

221220212211 is a `hidden beast` number, since 2 + 21 + 220 + 212 + 211 = 666.

It is not a de Polignac number, because 221220212211 - 2⁹ = 221220211699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221220212219) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1365556785 + ... + 1365556946.

Almost surely, 2^221220212211 is an apocalyptic number.

221220212211 is a deficient number, since it is larger than the sum of its proper divisors (109244549361).

221220212211 is an equidigital number, since it uses as much as digits as its factorization.

221220212211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2731113743 (or 2731113734 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 221220212211 its reverse (112212022122), we get a palindrome (333432234333).

The spelling of 221220212211 in words is "two hundred twenty-one billion, two hundred twenty million, two hundred twelve thousand, two hundred eleven".