221111212011 has 48 divisors (see below), whose sum is σ = 335626900224. Its totient is φ = 129117390336.

The previous prime is 221111211953. The next prime is 221111212043. The reversal of 221111212011 is 110212111122.

It is a happy number.

It is not a de Polignac number, because 221111212011 - 2⁷ = 221111211883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221111212051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 587976 + ... + 887658.

It is an arithmetic number, because the mean of its divisors is an integer number (6992227088).

Almost surely, 2^221111212011 is an apocalyptic number.

221111212011 is a deficient number, since it is larger than the sum of its proper divisors (114515688213).

221111212011 is a wasteful number, since it uses less digits than its factorization.

221111212011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299780 (or 299763 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 221111212011 its reverse (110212111122), we get a palindrome (331323323133).

The spelling of 221111212011 in words is "two hundred twenty-one billion, one hundred eleven million, two hundred twelve thousand, eleven".