1384647247721 has 4 divisors (see below), whose sum is σ = 1408115845200. Its totient is φ = 1361178650244.

The previous prime is 1384647247667. The next prime is 1384647247747. The reversal of 1384647247721 is 1277427464831.

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 a de Polignac number, because none of the positive numbers 2^k-1384647247721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1384647247021) 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, 11734298651 + ... + 11734298768.

It is an arithmetic number, because the mean of its divisors is an integer number (352028961300).

Almost surely, 2^{1384647247721} is an apocalyptic number.

It is an amenable number.

1384647247721 is a deficient number, since it is larger than the sum of its proper divisors (23468597479).

1384647247721 is an equidigital number, since it uses as much as digits as its factorization.

1384647247721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23468597478.

The product of its digits is 12644352, while the sum is 56.

The spelling of 1384647247721 in words is "one trillion, three hundred eighty-four billion, six hundred forty-seven million, two hundred forty-seven thousand, seven hundred twenty-one".