44394577921 has 4 divisors (see below), whose sum is σ = 44450988592. Its totient is φ = 44338167252.

The previous prime is 44394577859. The next prime is 44394577979. The reversal of 44394577921 is 12977549344.

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 not a de Polignac number, because 44394577921 - 2⁷ = 44394577793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (44397577921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28204155 + ... + 28205728.

It is an arithmetic number, because the mean of its divisors is an integer number (11112747148).

Almost surely, 2^44394577921 is an apocalyptic number.

It is an amenable number.

44394577921 is a deficient number, since it is larger than the sum of its proper divisors (56410671).

44394577921 is an equidigital number, since it uses as much as digits as its factorization.

44394577921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56410670.

The product of its digits is 7620480, while the sum is 55.

The spelling of 44394577921 in words is "forty-four billion, three hundred ninety-four million, five hundred seventy-seven thousand, nine hundred twenty-one".