111221212101012 has 144 divisors (see below), whose sum is σ = 323752837563792. Its totient is φ = 31889957990400.

The previous prime is 111221212101001. The next prime is 111221212101017. The reversal of 111221212101012 is 210101212122111.

It is a happy number.

111221212101012 is a `hidden beast` number, since 111 + 221 + 21 + 210 + 101 + 2 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 2385282558096 + 108835929542916 = 1544436^2 + 10432446^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111221212101017) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 68402083 + ... + 70009194.

It is an arithmetic number, because the mean of its divisors is an integer number (2248283594193).

Almost surely, 2^{111221212101012} is an apocalyptic number.

111221212101012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

111221212101012 is an abundant number, since it is smaller than the sum of its proper divisors (212531625462780).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

111221212101012 is a wasteful number, since it uses less digits than its factorization.

111221212101012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138411418 (or 138411413 counting only the distinct ones).

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

Adding to 111221212101012 its reverse (210101212122111), we get a palindrome (321322424223123).

The spelling of 111221212101012 in words is "one hundred eleven trillion, two hundred twenty-one billion, two hundred twelve million, one hundred one thousand, twelve".