2243887821 has 96 divisors (see below), whose sum is σ = 4045184000. Its totient is φ = 1194510240.

The previous prime is 2243887813. The next prime is 2243887861. The reversal of 2243887821 is 1287883422.

2243887821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2243887821 - 2³ = 2243887813 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 (2243887861) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3929466 + ... + 3930036.

Almost surely, 2^2243887821 is an apocalyptic number.

2243887821 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2243887821 is a deficient number, since it is larger than the sum of its proper divisors (1801296179).

2243887821 is a wasteful number, since it uses less digits than its factorization.

2243887821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 684 (or 667 counting only the distinct ones).

The product of its digits is 344064, while the sum is 45.

The square root of 2243887821 is about 47369.6930642368. The cubic root of 2243887821 is about 1309.1830698992.

The spelling of 2243887821 in words is "two billion, two hundred forty-three million, eight hundred eighty-seven thousand, eight hundred twenty-one".