111212121002221 has 8 divisors (see below), whose sum is σ = 111533479589664. Its totient is φ = 110890767372720.

The previous prime is 111212121002179. The next prime is 111212121002261. The reversal of 111212121002221 is 122200121212111.

It is a happy number.

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 111212121002221 - 2⁷ = 111212121002093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111212121002261) 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, 46319886 + ... + 48661648.

It is an arithmetic number, because the mean of its divisors is an integer number (13941684948708).

Almost surely, 2^{111212121002221} is an apocalyptic number.

It is an amenable number.

111212121002221 is a deficient number, since it is larger than the sum of its proper divisors (321358587443).

111212121002221 is a wasteful number, since it uses less digits than its factorization.

111212121002221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2478971.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 111212121002221 its reverse (122200121212111), we get a palindrome (233412242214332).

The spelling of 111212121002221 in words is "one hundred eleven trillion, two hundred twelve billion, one hundred twenty-one million, two thousand, two hundred twenty-one".