311220100221 has 4 divisors (see below), whose sum is σ = 414960133632. Its totient is φ = 207480066812.

The previous prime is 311220100171. The next prime is 311220100237. The reversal of 311220100221 is 122001022113.

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 311220100221 - 2³⁵ = 276860361853 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 311220100221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311220100421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51870016701 + ... + 51870016706.

It is an arithmetic number, because the mean of its divisors is an integer number (103740033408).

Almost surely, 2^311220100221 is an apocalyptic number.

It is an amenable number.

311220100221 is a deficient number, since it is larger than the sum of its proper divisors (103740033411).

311220100221 is a wasteful number, since it uses less digits than its factorization.

311220100221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103740033410.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 311220100221 its reverse (122001022113), we get a palindrome (433221122334).

The spelling of 311220100221 in words is "three hundred eleven billion, two hundred twenty million, one hundred thousand, two hundred twenty-one".