1329780197021 has 8 divisors (see below), whose sum is σ = 1360530741888. Its totient is φ = 1299318390000.

The previous prime is 1329780197017. The next prime is 1329780197029. The reversal of 1329780197021 is 1207910879231.

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

It is a cyclic number.

It is not a de Polignac number, because 1329780197021 - 2² = 1329780197017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1329780197029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72175145 + ... + 72193566.

It is an arithmetic number, because the mean of its divisors is an integer number (170066342736).

Almost surely, 2^{1329780197021} is an apocalyptic number.

It is an amenable number.

1329780197021 is a deficient number, since it is larger than the sum of its proper divisors (30750544867).

1329780197021 is a wasteful number, since it uses less digits than its factorization.

1329780197021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144368923.

The product of its (nonzero) digits is 381024, while the sum is 50.

The spelling of 1329780197021 in words is "one trillion, three hundred twenty-nine billion, seven hundred eighty million, one hundred ninety-seven thousand, twenty-one".