2043400221 has 48 divisors (see below), whose sum is σ = 3223350000. Its totient is φ = 1246482432.

The previous prime is 2043400207. The next prime is 2043400223. The reversal of 2043400221 is 1220043402.

2043400221 is a `hidden beast` number, since 2 + 0 + 43 + 400 + 221 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 108368100 + 1935032121 = 10410^2 + 43989^2 .

It is not a de Polignac number, because 2043400221 - 2¹¹ = 2043398173 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2043400194 and 2043400203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2043400223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1635405 + ... + 1636653.

It is an arithmetic number, because the mean of its divisors is an integer number (67153125).

Almost surely, 2^2043400221 is an apocalyptic number.

It is an amenable number.

2043400221 is a deficient number, since it is larger than the sum of its proper divisors (1179949779).

2043400221 is a wasteful number, since it uses less digits than its factorization.

2043400221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1343 (or 1306 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 2043400221 is about 45203.9845699469. The cubic root of 2043400221 is about 1268.9693874919.

Adding to 2043400221 its reverse (1220043402), we get a palindrome (3263443623).

The spelling of 2043400221 in words is "two billion, forty-three million, four hundred thousand, two hundred twenty-one".