221111111120211 has 12 divisors (see below), whose sum is σ = 343950617298288. Its totient is φ = 136068376073904.

The previous prime is 221111111120173. The next prime is 221111111120287. The reversal of 221111111120211 is 112021111111122.

221111111120211 is a `hidden beast` number, since 2 + 211 + 11 + 111 + 120 + 211 = 666.

It is not a de Polignac number, because 221111111120211 - 2⁹ = 221111111119699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221111101120211) 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, 944919278175 + ... + 944919278408.

It is an arithmetic number, because the mean of its divisors is an integer number (28662551441524).

Almost surely, 2^{221111111120211} is an apocalyptic number.

221111111120211 is a deficient number, since it is larger than the sum of its proper divisors (122839506178077).

221111111120211 is a wasteful number, since it uses less digits than its factorization.

221111111120211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1889838556602 (or 1889838556599 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 18.

Adding to 221111111120211 its reverse (112021111111122), we get a palindrome (333132222231333).

The spelling of 221111111120211 in words is "two hundred twenty-one trillion, one hundred eleven billion, one hundred eleven million, one hundred twenty thousand, two hundred eleven".