221211211002111 has 16 divisors (see below), whose sum is σ = 357513068286720. Its totient is φ = 134067400607160.

The previous prime is 221211211002097. The next prime is 221211211002193. The reversal of 221211211002111 is 111200112112122.

It is a happy number.

221211211002111 is a `hidden beast` number, since 221 + 21 + 1 + 211 + 0 + 0 + 211 + 1 = 666.

It is not a de Polignac number, because 221211211002111 - 2¹³ = 221211210993919 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221211211002011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 372409445835 + ... + 372409446428.

It is an arithmetic number, because the mean of its divisors is an integer number (22344566767920).

Almost surely, 2^{221211211002111} is an apocalyptic number.

221211211002111 is a deficient number, since it is larger than the sum of its proper divisors (136301857284609).

221211211002111 is a wasteful number, since it uses less digits than its factorization.

221211211002111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 744818892283 (or 744818892277 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 221211211002111 its reverse (111200112112122), we get a palindrome (332411323114233).

The spelling of 221211211002111 in words is "two hundred twenty-one trillion, two hundred eleven billion, two hundred eleven million, two thousand, one hundred eleven".