4402400221 has 4 divisors (see below), whose sum is σ = 4445988444. Its totient is φ = 4358812000.

The previous prime is 4402400201. The next prime is 4402400273. The reversal of 4402400221 is 1220042044.

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 3513525625 + 888874596 = 59275^2 + 29814^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4402400221 is a prime.

It is a super-2 number, since 2×4402400221² = 38762255411721697682, which 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 (4402400201) 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, 21793960 + ... + 21794161.

It is an arithmetic number, because the mean of its divisors is an integer number (1111497111).

Almost surely, 2^4402400221 is an apocalyptic number.

It is an amenable number.

4402400221 is a deficient number, since it is larger than the sum of its proper divisors (43588223).

4402400221 is a wasteful number, since it uses less digits than its factorization.

4402400221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43588222.

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 4402400221 is about 66350.5856869402. The cubic root of 4402400221 is about 1638.9404494801.

Adding to 4402400221 its reverse (1220042044), we get a palindrome (5622442265).

The spelling of 4402400221 in words is "four billion, four hundred two million, four hundred thousand, two hundred twenty-one".