1287288377221 has 32 divisors (see below), whose sum is σ = 1610841791232. Its totient is φ = 999393500160.

The previous prime is 1287288377159. The next prime is 1287288377227. The reversal of 1287288377221 is 1227738827821.

It is not a de Polignac number, because 1287288377221 - 2¹¹ = 1287288375173 is a prime.

It is a super-2 number, since 2×1287288377221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287288377227) 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 31 ways as a sum of consecutive naturals, for example, 26785005 + ... + 26833021.

It is an arithmetic number, because the mean of its divisors is an integer number (50338805976).

Almost surely, 2^{1287288377221} is an apocalyptic number.

1287288377221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1287288377221 is a deficient number, since it is larger than the sum of its proper divisors (323553414011).

1287288377221 is a wasteful number, since it uses less digits than its factorization.

1287288377221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49309.

The product of its digits is 8429568, while the sum is 58.

The spelling of 1287288377221 in words is "one trillion, two hundred eighty-seven billion, two hundred eighty-eight million, three hundred seventy-seven thousand, two hundred twenty-one".