2121111145 has 8 divisors (see below), whose sum is σ = 2593358856. Its totient is φ = 1664871936.

The previous prime is 2121111133. The next prime is 2121111149. The reversal of 2121111145 is 5411111212.

It can be written as a sum of positive squares in 4 ways, for example, as 341621289 + 1779489856 = 18483^2 + 42184^2 .

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 2121111145 - 2⁹ = 2121110633 is a prime.

It is a super-2 number, since 2×2121111145² = 8998224978886422050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121111149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4001832 + ... + 4002361.

It is an arithmetic number, because the mean of its divisors is an integer number (324169857).

Almost surely, 2^2121111145 is an apocalyptic number.

It is an amenable number.

2121111145 is a deficient number, since it is larger than the sum of its proper divisors (472247711).

2121111145 is an equidigital number, since it uses as much as digits as its factorization.

2121111145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8004251.

The product of its digits is 80, while the sum is 19.

The square root of 2121111145 is about 46055.5224158841. The cubic root of 2121111145 is about 1284.8560543689.

Adding to 2121111145 its reverse (5411111212), we get a palindrome (7532222357).

The spelling of 2121111145 in words is "two billion, one hundred twenty-one million, one hundred eleven thousand, one hundred forty-five".