1321254087720 has 128 divisors (see below), whose sum is σ = 4606794086400. Its totient is φ = 296882263296.

The previous prime is 1321254087719. The next prime is 1321254087733. The reversal of 1321254087720 is 277804521231.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13280284 + ... + 13379403.

It is an arithmetic number, because the mean of its divisors is an integer number (35990578800).

Almost surely, 2^{1321254087720} is an apocalyptic number.

1321254087720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321254087720 is an abundant number, since it is smaller than the sum of its proper divisors (3285539998680).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1321254087720 is a wasteful number, since it uses less digits than its factorization.

1321254087720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26659767 (or 26659763 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 42.

The spelling of 1321254087720 in words is "one trillion, three hundred twenty-one billion, two hundred fifty-four million, eighty-seven thousand, seven hundred twenty".