111211212220101 has 24 divisors (see below), whose sum is σ = 187492864376064. Its totient is φ = 62197152121440.

The previous prime is 111211212220091. The next prime is 111211212220139. The reversal of 111211212220101 is 101022212112111.

It is a happy number.

111211212220101 is a `hidden beast` number, since 1 + 11 + 211 + 212 + 220 + 10 + 1 = 666.

It is not a de Polignac number, because 111211212220101 - 2⁴⁵ = 76026840131269 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111211212220151) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18779330410 + ... + 18779336331.

It is an arithmetic number, because the mean of its divisors is an integer number (7812202682336).

Almost surely, 2^{111211212220101} is an apocalyptic number.

It is an amenable number.

111211212220101 is a deficient number, since it is larger than the sum of its proper divisors (76281652155963).

111211212220101 is a wasteful number, since it uses less digits than its factorization.

111211212220101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37558666801 (or 37558666798 counting only the distinct ones).

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

Adding to 111211212220101 its reverse (101022212112111), we get a palindrome (212233424332212).

The spelling of 111211212220101 in words is "one hundred eleven trillion, two hundred eleven billion, two hundred twelve million, two hundred twenty thousand, one hundred one".