111202121101221 has 16 divisors (see below), whose sum is σ = 164744090334720. Its totient is φ = 74134654151040.

The previous prime is 111202121101217. The next prime is 111202121101237. The reversal of 111202121101221 is 122101121202111.

It is a happy number.

111202121101221 is a `hidden beast` number, since 1 + 1 + 120 + 212 + 110 + 1 + 221 = 666.

It is not a de Polignac number, because 111202121101221 - 2² = 111202121101217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111202121101194 and 111202121101203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111202121101271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24377356 + ... + 28577258.

It is an arithmetic number, because the mean of its divisors is an integer number (10296505645920).

Almost surely, 2^{111202121101221} is an apocalyptic number.

It is an amenable number.

111202121101221 is a deficient number, since it is larger than the sum of its proper divisors (53541969233499).

111202121101221 is an equidigital number, since it uses as much as digits as its factorization.

111202121101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5180553 (or 5180547 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 111202121101221 its reverse (122101121202111), we get a palindrome (233303242303332).

The spelling of 111202121101221 in words is "one hundred eleven trillion, two hundred two billion, one hundred twenty-one million, one hundred one thousand, two hundred twenty-one".