1275384835721 has 8 divisors (see below), whose sum is σ = 1294461208320. Its totient is φ = 1256309662608.

The previous prime is 1275384835667. The next prime is 1275384835723.

It is a happy number.

1275384835721 is nontrivially palindromic in base 10.

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 1275384835721 - 2²⁶ = 1275317726857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1275384835723) 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, 1970120 + ... + 2536166.

It is an arithmetic number, because the mean of its divisors is an integer number (161807651040).

Almost surely, 2^{1275384835721} is an apocalyptic number.

It is an amenable number.

1275384835721 is a deficient number, since it is larger than the sum of its proper divisors (19076372599).

1275384835721 is an equidigital number, since it uses as much as digits as its factorization.

1275384835721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 599743.

The product of its digits is 11289600, while the sum is 56.

The spelling of 1275384835721 in words is "one trillion, two hundred seventy-five billion, three hundred eighty-four million, eight hundred thirty-five thousand, seven hundred twenty-one".