111221220121012 has 6 divisors (see below), whose sum is σ = 194637135211778. Its totient is φ = 55610610060504.

The previous prime is 111221220121001. The next prime is 111221220121021. The reversal of 111221220121012 is 210121022122111.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 66598232279076 + 44622987841936 = 8160774^2 + 6680044^2 .

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 13902652515123 + ... + 13902652515130.

Almost surely, 2^{111221220121012} is an apocalyptic number.

It is an amenable number.

111221220121012 is a deficient number, since it is larger than the sum of its proper divisors (83415915090766).

111221220121012 is a wasteful number, since it uses less digits than its factorization.

111221220121012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27805305030257 (or 27805305030255 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 111221220121012 its reverse (210121022122111), we get a palindrome (321342242243123).

The spelling of 111221220121012 in words is "one hundred eleven trillion, two hundred twenty-one billion, two hundred twenty million, one hundred twenty-one thousand, twelve".