111222020020121 has 4 divisors (see below), whose sum is σ = 111222579255732. Its totient is φ = 111221460784512.

The previous prime is 111222020020093. The next prime is 111222020020151. The reversal of 111222020020121 is 121020020222111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 60967815459721 + 50254204560400 = 7808189^2 + 7089020^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111222020020121 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 111222020020121.

It is not an unprimeable number, because it can be changed into a prime (111222020020151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 279319376 + ... + 279717281.

It is an arithmetic number, because the mean of its divisors is an integer number (27805644813933).

Almost surely, 2^{111222020020121} is an apocalyptic number.

It is an amenable number.

111222020020121 is a deficient number, since it is larger than the sum of its proper divisors (559235611).

111222020020121 is an equidigital number, since it uses as much as digits as its factorization.

111222020020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559235610.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 111222020020121 its reverse (121020020222111), we get a palindrome (232242040242232).

The spelling of 111222020020121 in words is "one hundred eleven trillion, two hundred twenty-two billion, twenty million, twenty thousand, one hundred twenty-one".