311431322240221 has 4 divisors (see below), whose sum is σ = 311431982436352. Its totient is φ = 311430662044092.

The previous prime is 311431322240219. The next prime is 311431322240267. The reversal of 311431322240221 is 122042223134113.

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 311431322240221 - 2¹ = 311431322240219 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 (311431322249221) 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, 329389971 + ... + 330334096.

It is an arithmetic number, because the mean of its divisors is an integer number (77857995609088).

Almost surely, 2^{311431322240221} is an apocalyptic number.

It is an amenable number.

311431322240221 is a deficient number, since it is larger than the sum of its proper divisors (660196131).

311431322240221 is an equidigital number, since it uses as much as digits as its factorization.

311431322240221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660196130.

The product of its (nonzero) digits is 13824, while the sum is 31.

Adding to 311431322240221 its reverse (122042223134113), we get a palindrome (433473545374334).

The spelling of 311431322240221 in words is "three hundred eleven trillion, four hundred thirty-one billion, three hundred twenty-two million, two hundred forty thousand, two hundred twenty-one".