44721021 has 4 divisors (see below), whose sum is σ = 59628032. Its totient is φ = 29814012.

The previous prime is 44721007. The next prime is 44721023. The reversal of 44721021 is 12012744.

It is a happy number.

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 44721021 - 2¹⁵ = 44688253 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 (44721023) 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, 7453501 + ... + 7453506.

It is an arithmetic number, because the mean of its divisors is an integer number (14907008).

Almost surely, 2^44721021 is an apocalyptic number.

It is an amenable number.

44721021 is a deficient number, since it is larger than the sum of its proper divisors (14907011).

44721021 is a wasteful number, since it uses less digits than its factorization.

44721021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14907010.

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 44721021 is about 6687.3777372001. The cubic root of 44721021 is about 354.9527702823.

Adding to 44721021 its reverse (12012744), we get a palindrome (56733765).

The spelling of 44721021 in words is "forty-four million, seven hundred twenty-one thousand, twenty-one".