1287058811721 has 8 divisors (see below), whose sum is σ = 1806398332320. Its totient is φ = 812879249472.

The previous prime is 1287058811711. The next prime is 1287058811743. The reversal of 1287058811721 is 1271188507821.

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

It is not a de Polignac number, because 1287058811721 - 2²⁵ = 1287025257289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1287058811711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11289989520 + ... + 11289989633.

It is an arithmetic number, because the mean of its divisors is an integer number (225799791540).

Almost surely, 2^{1287058811721} is an apocalyptic number.

It is an amenable number.

1287058811721 is a deficient number, since it is larger than the sum of its proper divisors (519339520599).

1287058811721 is a wasteful number, since it uses less digits than its factorization.

1287058811721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22579979175.

The product of its (nonzero) digits is 501760, while the sum is 51.

The spelling of 1287058811721 in words is "one trillion, two hundred eighty-seven billion, fifty-eight million, eight hundred eleven thousand, seven hundred twenty-one".