281344720321 has 8 divisors (see below), whose sum is σ = 338459814080. Its totient is φ = 228460374288.

The previous prime is 281344720271. The next prime is 281344720331. The reversal of 281344720321 is 123027443182.

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

It is a cyclic number.

It is not a de Polignac number, because 281344720321 - 2¹⁹ = 281344196033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (281344720331) 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, 1057686786 + ... + 1057687051.

It is an arithmetic number, because the mean of its divisors is an integer number (42307476760).

Almost surely, 2^281344720321 is an apocalyptic number.

It is an amenable number.

281344720321 is a deficient number, since it is larger than the sum of its proper divisors (57115093759).

281344720321 is a wasteful number, since it uses less digits than its factorization.

281344720321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2115373863.

The product of its (nonzero) digits is 64512, while the sum is 37.

The spelling of 281344720321 in words is "two hundred eighty-one billion, three hundred forty-four million, seven hundred twenty thousand, three hundred twenty-one".