111211202122221 has 8 divisors (see below), whose sum is σ = 149947688255040. Its totient is φ = 73307758702112.

The previous prime is 111211202122169. The next prime is 111211202122261. The reversal of 111211202122221 is 122221202112111.

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

It is a cyclic number.

It is not a de Polignac number, because 111211202122221 - 2¹⁰ = 111211202121197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111211202122261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 208260677865 + ... + 208260678398.

It is an arithmetic number, because the mean of its divisors is an integer number (18743461031880).

Almost surely, 2^{111211202122221} is an apocalyptic number.

It is an amenable number.

111211202122221 is a deficient number, since it is larger than the sum of its proper divisors (38736486132819).

111211202122221 is an equidigital number, since it uses as much as digits as its factorization.

111211202122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416521356355.

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 111211202122221 its reverse (122221202112111), we get a palindrome (233432404234332).

The spelling of 111211202122221 in words is "one hundred eleven trillion, two hundred eleven billion, two hundred two million, one hundred twenty-two thousand, two hundred twenty-one".