112122121221 has 36 divisors (see below), whose sum is σ = 180934144300. Its totient is φ = 66838780800.

The previous prime is 112122121183. The next prime is 112122121261. The reversal of 112122121221 is 122121221211.

It can be written as a sum of positive squares in 2 ways, for example, as 11446004196 + 100676117025 = 106986^2 + 317295^2 .

It is not a de Polignac number, because 112122121221 - 2¹³ = 112122113029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 112122121194 and 112122121203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (112122121261) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 777496 + ... + 910353.

Almost surely, 2^112122121221 is an apocalyptic number.

112122121221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

112122121221 is a deficient number, since it is larger than the sum of its proper divisors (68812023079).

112122121221 is a wasteful number, since it uses less digits than its factorization.

112122121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1687938 (or 1687924 counting only the distinct ones).

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

Adding to 112122121221 its reverse (122121221211), we get a palindrome (234243342432).

The spelling of 112122121221 in words is "one hundred twelve billion, one hundred twenty-two million, one hundred twenty-one thousand, two hundred twenty-one".