111121212010221 has 20 divisors (see below), whose sum is σ = 189709582409952. Its totient is φ = 63497835434088.

The previous prime is 111121212010219. The next prime is 111121212010267. The reversal of 111121212010221 is 122010212121111.

It is a happy number.

111121212010221 is a `hidden beast` number, since 1 + 111 + 212 + 120 + 1 + 0 + 221 = 666.

It is not a de Polignac number, because 111121212010221 - 2¹ = 111121212010219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111121212010194 and 111121212010203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111121212010021) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 97990486215 + ... + 97990487348.

Almost surely, 2^{111121212010221} is an apocalyptic number.

It is an amenable number.

111121212010221 is a deficient number, since it is larger than the sum of its proper divisors (78588370399731).

111121212010221 is an equidigital number, since it uses as much as digits as its factorization.

111121212010221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195980973582 (or 195980973573 counting only the distinct ones).

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

Adding to 111121212010221 its reverse (122010212121111), we get a palindrome (233131424131332).

The spelling of 111121212010221 in words is "one hundred eleven trillion, one hundred twenty-one billion, two hundred twelve million, ten thousand, two hundred twenty-one".