780001221101 has 4 divisors (see below), whose sum is σ = 780330199104. Its totient is φ = 779672243100.

The previous prime is 780001221053. The next prime is 780001221127. The reversal of 780001221101 is 101122100087.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 780001221101 - 2⁶ = 780001221037 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 (780001223101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164485445 + ... + 164490186.

It is an arithmetic number, because the mean of its divisors is an integer number (195082549776).

Almost surely, 2^780001221101 is an apocalyptic number.

It is an amenable number.

780001221101 is a deficient number, since it is larger than the sum of its proper divisors (328978003).

780001221101 is a wasteful number, since it uses less digits than its factorization.

780001221101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328978002.

The product of its (nonzero) digits is 224, while the sum is 23.

Adding to 780001221101 its reverse (101122100087), we get a palindrome (881123321188).

The spelling of 780001221101 in words is "seven hundred eighty billion, one million, two hundred twenty-one thousand, one hundred one".