1321023021376 has 28 divisors (see below), whose sum is σ = 2621455211232. Its totient is φ = 660498873728.

The previous prime is 1321023021347. The next prime is 1321023021377. The reversal of 1321023021376 is 6731203201231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321023021377) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 3801741 + ... + 4134643.

Almost surely, 2^{1321023021376} is an apocalyptic number.

1321023021376 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1321023021376 is a deficient number, since it is larger than the sum of its proper divisors (1300432189856).

1321023021376 is an equidigital number, since it uses as much as digits as its factorization.

1321023021376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394918 (or 394908 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 31.

The spelling of 1321023021376 in words is "one trillion, three hundred twenty-one billion, twenty-three million, twenty-one thousand, three hundred seventy-six".