111021012120221 has 6 divisors (see below), whose sum is σ = 129146891650110. Its totient is φ = 95160867531576.

The previous prime is 111021012120211. The next prime is 111021012120223. The reversal of 111021012120221 is 122021210120111.

It can be written as a sum of positive squares in only one way, i.e., 109534246471321 + 1486765648900 = 10465861^2 + 1219330^2 .

It is a de Polignac number, because none of the positive numbers 2^k-111021012120221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 111021012120221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111021012120223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1132867470566 + ... + 1132867470663.

It is an arithmetic number, because the mean of its divisors is an integer number (21524481941685).

Almost surely, 2^{111021012120221} is an apocalyptic number.

It is an amenable number.

111021012120221 is a deficient number, since it is larger than the sum of its proper divisors (18125879529889).

111021012120221 is an equidigital number, since it uses as much as digits as its factorization.

111021012120221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2265734941243 (or 2265734941236 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 111021012120221 its reverse (122021210120111), we get a palindrome (233042222240332).

The spelling of 111021012120221 in words is "one hundred eleven trillion, twenty-one billion, twelve million, one hundred twenty thousand, two hundred twenty-one".