4421421021 has 4 divisors (see below), whose sum is σ = 5895228032. Its totient is φ = 2947614012.

The previous prime is 4421421019. The next prime is 4421421029. The reversal of 4421421021 is 1201241244.

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 not a de Polignac number, because 4421421021 - 2¹ = 4421421019 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 (4421421029) 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 3 ways as a sum of consecutive naturals, for example, 736903501 + ... + 736903506.

It is an arithmetic number, because the mean of its divisors is an integer number (1473807008).

Almost surely, 2^4421421021 is an apocalyptic number.

It is an amenable number.

4421421021 is a deficient number, since it is larger than the sum of its proper divisors (1473807011).

4421421021 is a wasteful number, since it uses less digits than its factorization.

4421421021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1473807010.

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 4421421021 is about 66493.7667830602. The cubic root of 4421421021 is about 1641.2974341669.

Adding to 4421421021 its reverse (1201241244), we get a palindrome (5622662265).

The spelling of 4421421021 in words is "four billion, four hundred twenty-one million, four hundred twenty-one thousand, twenty-one".