744254520221 has 8 divisors (see below), whose sum is σ = 764413828440. Its totient is φ = 724097544768.

The previous prime is 744254520181. The next prime is 744254520227. The reversal of 744254520221 is 122025452447.

It can be written as a sum of positive squares in 4 ways, for example, as 54574099321 + 689680420900 = 233611^2 + 830470^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-744254520221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (744254520227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73415 + ... + 1222251.

It is an arithmetic number, because the mean of its divisors is an integer number (95551728555).

Almost surely, 2^744254520221 is an apocalyptic number.

It is an amenable number.

744254520221 is a deficient number, since it is larger than the sum of its proper divisors (20159308219).

744254520221 is a wasteful number, since it uses less digits than its factorization.

744254520221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1166383.

The product of its (nonzero) digits is 179200, while the sum is 38.

Adding to 744254520221 its reverse (122025452447), we get a palindrome (866279972668).

The spelling of 744254520221 in words is "seven hundred forty-four billion, two hundred fifty-four million, five hundred twenty thousand, two hundred twenty-one".