775202220221 has 8 divisors (see below), whose sum is σ = 910727084064. Its totient is φ = 650519345520.

The previous prime is 775202220203. The next prime is 775202220227. The reversal of 775202220221 is 122022202577.

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

It is not a de Polignac number, because 775202220221 - 2⁶ = 775202220157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (775202220227) 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 7 ways as a sum of consecutive naturals, for example, 2710497131 + ... + 2710497416.

It is an arithmetic number, because the mean of its divisors is an integer number (113840885508).

Almost surely, 2^775202220221 is an apocalyptic number.

It is an amenable number.

775202220221 is a deficient number, since it is larger than the sum of its proper divisors (135524863843).

775202220221 is a wasteful number, since it uses less digits than its factorization.

775202220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5420994571.

The product of its (nonzero) digits is 15680, while the sum is 32.

Adding to 775202220221 its reverse (122022202577), we get a palindrome (897224422798).

The spelling of 775202220221 in words is "seven hundred seventy-five billion, two hundred two million, two hundred twenty thousand, two hundred twenty-one".