111212220220121 has 4 divisors (see below), whose sum is σ = 111212245473744. Its totient is φ = 111212194966500.

The previous prime is 111212220220117. The next prime is 111212220220147. The reversal of 111212220220121 is 121022022212111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 111212220220121 - 2² = 111212220220117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 111212220220093 and 111212220220102.

It is not an unprimeable number, because it can be changed into a prime (111212220220181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4103135 + ... + 15468036.

It is an arithmetic number, because the mean of its divisors is an integer number (27803061368436).

Almost surely, 2^{111212220220121} is an apocalyptic number.

It is an amenable number.

111212220220121 is a deficient number, since it is larger than the sum of its proper divisors (25253623).

111212220220121 is an equidigital number, since it uses as much as digits as its factorization.

111212220220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25253622.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 111212220220121 its reverse (121022022212111), we get a palindrome (232234242432232).

The spelling of 111212220220121 in words is "one hundred eleven trillion, two hundred twelve billion, two hundred twenty million, two hundred twenty thousand, one hundred twenty-one".