44021421 has 8 divisors (see below), whose sum is σ = 65216960. Its totient is φ = 29347596.

The previous prime is 44021401. The next prime is 44021431. The reversal of 44021421 is 12412044.

It is not a de Polignac number, because 44021421 - 2⁹ = 44020909 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 44021394 and 44021403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (44021401) 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 7 ways as a sum of consecutive naturals, for example, 815185 + ... + 815238.

It is an arithmetic number, because the mean of its divisors is an integer number (8152120).

Almost surely, 2^44021421 is an apocalyptic number.

It is an amenable number.

44021421 is a deficient number, since it is larger than the sum of its proper divisors (21195539).

44021421 is a wasteful number, since it uses less digits than its factorization.

44021421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1630432 (or 1630426 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 44021421 is about 6634.8640528650. The cubic root of 44021421 is about 353.0921148378.

Adding to 44021421 its reverse (12412044), we get a palindrome (56433465).

The spelling of 44021421 in words is "forty-four million, twenty-one thousand, four hundred twenty-one".