591220120221 has 6 divisors (see below), whose sum is σ = 853984618110. Its totient is φ = 394146746808.

The previous prime is 591220120219. The next prime is 591220120229. The reversal of 591220120221 is 122021022195.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 501633644121 + 89586476100 = 708261^2 + 299310^2 .

It is not a de Polignac number, because 591220120221 - 2¹ = 591220120219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (591220120229) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 32845562226 + ... + 32845562243.

It is an arithmetic number, because the mean of its divisors is an integer number (142330769685).

Almost surely, 2^591220120221 is an apocalyptic number.

It is an amenable number.

591220120221 is a deficient number, since it is larger than the sum of its proper divisors (262764497889).

591220120221 is a wasteful number, since it uses less digits than its factorization.

591220120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65691124475 (or 65691124472 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The spelling of 591220120221 in words is "five hundred ninety-one billion, two hundred twenty million, one hundred twenty thousand, two hundred twenty-one".