44431021 has 4 divisors (see below), whose sum is σ = 44444700. Its totient is φ = 44417344.

The previous prime is 44430989. The next prime is 44431031. The reversal of 44431021 is 12013444.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 11655396 + 32775625 = 3414^2 + 5725^2 .

It is a cyclic number.

It is not a de Polignac number, because 44431021 - 2⁵ = 44430989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 44431021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (44431031) 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, 1125 + ... + 9493.

It is an arithmetic number, because the mean of its divisors is an integer number (11111175).

Almost surely, 2^44431021 is an apocalyptic number.

It is an amenable number.

44431021 is a deficient number, since it is larger than the sum of its proper divisors (13679).

44431021 is an equidigital number, since it uses as much as digits as its factorization.

44431021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13678.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 44431021 is about 6665.6598323047. The cubic root of 44431021 is about 354.1838581244.

Adding to 44431021 its reverse (12013444), we get a palindrome (56444465).

It can be divided in two parts, 4 and 4431021, that added together give a square (4431025 = 2105²).

The spelling of 44431021 in words is "forty-four million, four hundred thirty-one thousand, twenty-one".