2211844373821 has 4 divisors (see below), whose sum is σ = 2288114869500. Its totient is φ = 2135573878144.

The previous prime is 2211844373759. The next prime is 2211844373831. The reversal of 2211844373821 is 1283734481122.

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 727319008900 + 1484525364921 = 852830^2 + 1218411^2 .

It is a cyclic number.

It is not a de Polignac number, because 2211844373821 - 2²¹ = 2211842276669 is a prime.

It is a super-2 number, since 2×2211844373821² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2211844373831) 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, 38135247796 + ... + 38135247853.

It is an arithmetic number, because the mean of its divisors is an integer number (572028717375).

Almost surely, 2^{2211844373821} is an apocalyptic number.

It is an amenable number.

2211844373821 is a deficient number, since it is larger than the sum of its proper divisors (76270495679).

2211844373821 is an equidigital number, since it uses as much as digits as its factorization.

2211844373821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76270495678.

The product of its digits is 516096, while the sum is 46.

The spelling of 2211844373821 in words is "two trillion, two hundred eleven billion, eight hundred forty-four million, three hundred seventy-three thousand, eight hundred twenty-one".