2211023813 has 4 divisors (see below), whose sum is σ = 2211131340. Its totient is φ = 2210916288.

The previous prime is 2211023807. The next prime is 2211023821. The reversal of 2211023813 is 3183201122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3183201122 = 2 ⋅1591600561.

It can be written as a sum of positive squares in 2 ways, for example, as 483208324 + 1727815489 = 21982^2 + 41567^2 .

It is a cyclic number.

It is not a de Polignac number, because 2211023813 - 2¹⁰ = 2211022789 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 (2211023513) 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, 12218 + ... + 67611.

It is an arithmetic number, because the mean of its divisors is an integer number (552782835).

Almost surely, 2^2211023813 is an apocalyptic number.

It is an amenable number.

2211023813 is a deficient number, since it is larger than the sum of its proper divisors (107527).

2211023813 is an equidigital number, since it uses as much as digits as its factorization.

2211023813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107526.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 2211023813 is about 47021.5249965375. The cubic root of 2211023813 is about 1302.7601734904.

Adding to 2211023813 its reverse (3183201122), we get a palindrome (5394224935).

The spelling of 2211023813 in words is "two billion, two hundred eleven million, twenty-three thousand, eight hundred thirteen".