1321779812001 has 8 divisors (see below), whose sum is σ = 1922588817504. Its totient is φ = 801078673920.

The previous prime is 1321779811993. The next prime is 1321779812009. The reversal of 1321779812001 is 1002189771231.

It is an interprime number because it is at equal distance from previous prime (1321779811993) and next prime (1321779812009).

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

It is not a de Polignac number, because 1321779812001 - 2³ = 1321779811993 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1321779812009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20026966816 + ... + 20026966881.

It is an arithmetic number, because the mean of its divisors is an integer number (240323602188).

Almost surely, 2^{1321779812001} is an apocalyptic number.

1321779812001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1321779812001 is a deficient number, since it is larger than the sum of its proper divisors (600809005503).

1321779812001 is a wasteful number, since it uses less digits than its factorization.

1321779812001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40053933711.

The product of its (nonzero) digits is 42336, while the sum is 42.

The spelling of 1321779812001 in words is "one trillion, three hundred twenty-one billion, seven hundred seventy-nine million, eight hundred twelve thousand, one".