112121111220221 has 4 divisors (see below), whose sum is σ = 112121145769212. Its totient is φ = 112121076671232.

The previous prime is 112121111220137. The next prime is 112121111220227. The reversal of 112121111220221 is 122022111121211.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 46547734308100 + 65573376912121 = 6822590^2 + 8097739^2 .

It is a cyclic number.

It is not a de Polignac number, because 112121111220221 - 2¹⁰ = 112121111219197 is a prime.

It is a super-2 number, since 2×112121111220221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 112121111220193 and 112121111220202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (112121111220227) 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, 11835806 + ... + 19087391.

It is an arithmetic number, because the mean of its divisors is an integer number (28030286442303).

Almost surely, 2^{112121111220221} is an apocalyptic number.

It is an amenable number.

112121111220221 is a deficient number, since it is larger than the sum of its proper divisors (34548991).

112121111220221 is an equidigital number, since it uses as much as digits as its factorization.

112121111220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34548990.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 112121111220221 its reverse (122022111121211), we get a palindrome (234143222341432).

The spelling of 112121111220221 in words is "one hundred twelve trillion, one hundred twenty-one billion, one hundred eleven million, two hundred twenty thousand, two hundred twenty-one".