221211011121111 has 32 divisors (see below), whose sum is σ = 357554451536640. Its totient is φ = 134051639608800.

The previous prime is 221211011121103. The next prime is 221211011121127. The reversal of 221211011121111 is 111121110112122.

221211011121111 is a `hidden beast` number, since 221 + 2 + 110 + 111 + 211 + 11 = 666.

It is not a de Polignac number, because 221211011121111 - 2³ = 221211011121103 is a prime.

It is a super-2 number, since 2×221211011121111² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221211011121151) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40893585 + ... + 45985946.

It is an arithmetic number, because the mean of its divisors is an integer number (11173576610520).

Almost surely, 2^{221211011121111} is an apocalyptic number.

221211011121111 is a deficient number, since it is larger than the sum of its proper divisors (136343440415529).

221211011121111 is a wasteful number, since it uses less digits than its factorization.

221211011121111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86888124 (or 86888118 counting only the distinct ones).

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

Adding to 221211011121111 its reverse (111121110112122), we get a palindrome (332332121233233).

The spelling of 221211011121111 in words is "two hundred twenty-one trillion, two hundred eleven billion, eleven million, one hundred twenty-one thousand, one hundred eleven".