111220121200221 has 48 divisors (see below), whose sum is σ = 176005135208448. Its totient is φ = 67118553223200.

The previous prime is 111220121200187. The next prime is 111220121200289. The reversal of 111220121200221 is 122002121022111.

111220121200221 is a `hidden beast` number, since 1 + 1 + 1 + 220 + 1 + 21 + 200 + 221 = 666.

It is not a de Polignac number, because 111220121200221 - 2¹⁷ = 111220121069149 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111220121200194 and 111220121200203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111220121200121) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 21141816 + ... + 25873086.

It is an arithmetic number, because the mean of its divisors is an integer number (3666773650176).

Almost surely, 2^{111220121200221} is an apocalyptic number.

111220121200221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111220121200221 is a deficient number, since it is larger than the sum of its proper divisors (64785014008227).

111220121200221 is a wasteful number, since it uses less digits than its factorization.

111220121200221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4732302 (or 4732299 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 111220121200221 its reverse (122002121022111), we get a palindrome (233222242222332).

The spelling of 111220121200221 in words is "one hundred eleven trillion, two hundred twenty billion, one hundred twenty-one million, two hundred thousand, two hundred twenty-one".