111012221212221 has 64 divisors (see below), whose sum is σ = 176379219394560. Its totient is φ = 60781674032640.

The previous prime is 111012221212157. The next prime is 111012221212289. The reversal of 111012221212221 is 122212122210111.

It is not a de Polignac number, because 111012221212221 - 2⁶ = 111012221212157 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111012221212021) 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 63 ways as a sum of consecutive naturals, for example, 174548761 + ... + 175183601.

It is an arithmetic number, because the mean of its divisors is an integer number (2755925303040).

Almost surely, 2^{111012221212221} is an apocalyptic number.

It is an amenable number.

111012221212221 is a deficient number, since it is larger than the sum of its proper divisors (65366998182339).

111012221212221 is a wasteful number, since it uses less digits than its factorization.

111012221212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 638314.

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 111012221212221 its reverse (122212122210111), we get a palindrome (233224343422332).

The spelling of 111012221212221 in words is "one hundred eleven trillion, twelve billion, two hundred twenty-one million, two hundred twelve thousand, two hundred twenty-one".