4443551221 has 4 divisors (see below), whose sum is σ = 4538094912. Its totient is φ = 4349007532.

The previous prime is 4443551207. The next prime is 4443551251. The reversal of 4443551221 is 1221553444.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4443551221 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 (4443551201) 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, 47271775 + ... + 47271868.

It is an arithmetic number, because the mean of its divisors is an integer number (1134523728).

Almost surely, 2^4443551221 is an apocalyptic number.

It is an amenable number.

4443551221 is a deficient number, since it is larger than the sum of its proper divisors (94543691).

4443551221 is an equidigital number, since it uses as much as digits as its factorization.

4443551221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94543690.

The product of its digits is 19200, while the sum is 31.

The square root of 4443551221 is about 66659.9671542073. The cubic root of 4443551221 is about 1644.0312315852.

The spelling of 4443551221 in words is "four billion, four hundred forty-three million, five hundred fifty-one thousand, two hundred twenty-one".