111201020211221 has 8 divisors (see below), whose sum is σ = 117787664475864. Its totient is φ = 104619421255680.

The previous prime is 111201020211133. The next prime is 111201020211287. The reversal of 111201020211221 is 122112020102111.

It can be written as a sum of positive squares in 4 ways, for example, as 54359447968996 + 56841572242225 = 7372886^2 + 7539335^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111201020211221 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

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 111201020211221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111201020211521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1261281890 + ... + 1261370051.

It is an arithmetic number, because the mean of its divisors is an integer number (14723458059483).

Almost surely, 2^{111201020211221} is an apocalyptic number.

It is an amenable number.

111201020211221 is a deficient number, since it is larger than the sum of its proper divisors (6586644264643).

111201020211221 is a wasteful number, since it uses less digits than its factorization.

111201020211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2522654551.

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

Adding to 111201020211221 its reverse (122112020102111), we get a palindrome (233313040313332).

The spelling of 111201020211221 in words is "one hundred eleven trillion, two hundred one billion, twenty million, two hundred eleven thousand, two hundred twenty-one".