780421221391 has 8 divisors (see below), whose sum is σ = 916015642400. Its totient is φ = 650853219168.

The previous prime is 780421221269. The next prime is 780421221397. The reversal of 780421221391 is 193122124087.

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 780421221391 - 2²⁷ = 780287003663 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 (780421221397) 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, 1506604416 + ... + 1506604933.

It is an arithmetic number, because the mean of its divisors is an integer number (114501955300).

Almost surely, 2^780421221391 is an apocalyptic number.

780421221391 is a deficient number, since it is larger than the sum of its proper divisors (135594421009).

780421221391 is a wasteful number, since it uses less digits than its factorization.

780421221391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3013209393.

The product of its (nonzero) digits is 48384, while the sum is 40.

The spelling of 780421221391 in words is "seven hundred eighty billion, four hundred twenty-one million, two hundred twenty-one thousand, three hundred ninety-one".