311431004432221 has 4 divisors (see below), whose sum is σ = 312313245238332. Its totient is φ = 310548763626112.

The previous prime is 311431004432173. The next prime is 311431004432257. The reversal of 311431004432221 is 122234400134113.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 236843789472900 + 74587214959321 = 15389730^2 + 8636389^2 .

It is a cyclic number.

It is not a de Polignac number, because 311431004432221 - 2⁹ = 311431004431709 is a prime.

It is a super-2 number, since 2×311431004432221² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311431004412221) 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, 441120402526 + ... + 441120403231.

It is an arithmetic number, because the mean of its divisors is an integer number (78078311309583).

Almost surely, 2^{311431004432221} is an apocalyptic number.

It is an amenable number.

311431004432221 is a deficient number, since it is larger than the sum of its proper divisors (882240806111).

311431004432221 is an equidigital number, since it uses as much as digits as its factorization.

311431004432221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 882240806110.

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

Adding to 311431004432221 its reverse (122234400134113), we get a palindrome (433665404566334).

The spelling of 311431004432221 in words is "three hundred eleven trillion, four hundred thirty-one billion, four million, four hundred thirty-two thousand, two hundred twenty-one".