2243966081821 has 4 divisors (see below), whose sum is σ = 2375964086652. Its totient is φ = 2111968076992.

The previous prime is 2243966081803. The next prime is 2243966081857. The reversal of 2243966081821 is 1281806693422.

It is a happy number.

2243966081821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 1894284268900 + 349681812921 = 1376330^2 + 591339^2 .

It is a cyclic number.

It is not a de Polignac number, because 2243966081821 - 2²⁹ = 2243429210909 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 (2243966081321) 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, 65999002390 + ... + 65999002423.

It is an arithmetic number, because the mean of its divisors is an integer number (593991021663).

Almost surely, 2^{2243966081821} is an apocalyptic number.

It is an amenable number.

2243966081821 is a deficient number, since it is larger than the sum of its proper divisors (131998004831).

2243966081821 is a wasteful number, since it uses less digits than its factorization.

2243966081821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131998004830.

The product of its (nonzero) digits is 1990656, while the sum is 52.

The spelling of 2243966081821 in words is "two trillion, two hundred forty-three billion, nine hundred sixty-six million, eighty-one thousand, eight hundred twenty-one".