2212111421 has 4 divisors (see below), whose sum is σ = 2382273852. Its totient is φ = 2041948992.

The previous prime is 2212111409. The next prime is 2212111427. The reversal of 2212111421 is 1241112122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1241112122 = 2 ⋅620556061.

It can be written as a sum of positive squares in 2 ways, for example, as 345439396 + 1866672025 = 18586^2 + 43205^2 .

It is a cyclic number.

It is not a de Polignac number, because 2212111421 - 2⁶ = 2212111357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2212111421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2212111427) 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, 85081196 + ... + 85081221.

It is an arithmetic number, because the mean of its divisors is an integer number (595568463).

Almost surely, 2^2212111421 is an apocalyptic number.

It is an amenable number.

2212111421 is a deficient number, since it is larger than the sum of its proper divisors (170162431).

2212111421 is a wasteful number, since it uses less digits than its factorization.

2212111421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170162430.

The product of its digits is 64, while the sum is 17.

The square root of 2212111421 is about 47033.0885760227. The cubic root of 2212111421 is about 1302.9737487759.

Adding to 2212111421 its reverse (1241112122), we get a palindrome (3453223543).

The spelling of 2212111421 in words is "two billion, two hundred twelve million, one hundred eleven thousand, four hundred twenty-one".