221221112211 has 12 divisors (see below), whose sum is σ = 348590843640. Its totient is φ = 134073401280.

The previous prime is 221221112209. The next prime is 221221112213. The reversal of 221221112211 is 112211122122.

221221112211 is a `hidden beast` number, since 221 + 221 + 1 + 1 + 221 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (221221112209) and next prime (221221112213).

It is not a de Polignac number, because 221221112211 - 2¹ = 221221112209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221221112213) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1117278246 + ... + 1117278443.

It is an arithmetic number, because the mean of its divisors is an integer number (29049236970).

Almost surely, 2^221221112211 is an apocalyptic number.

221221112211 is a deficient number, since it is larger than the sum of its proper divisors (127369731429).

221221112211 is a wasteful number, since it uses less digits than its factorization.

221221112211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2234556706 (or 2234556703 counting only the distinct ones).

The product of its digits is 64, while the sum is 18.

Adding to 221221112211 its reverse (112211122122), we get a palindrome (333432234333).

The spelling of 221221112211 in words is "two hundred twenty-one billion, two hundred twenty-one million, one hundred twelve thousand, two hundred eleven".