311430224323021 has 4 divisors (see below), whose sum is σ = 311430377500732. Its totient is φ = 311430071145312.

The previous prime is 311430224322929. The next prime is 311430224323037. The reversal of 311430224323021 is 120323422034113.

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 295370248222921 + 16059976100100 = 17186339^2 + 4007490^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311430224323021 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 (311430224323061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73497570 + ... + 77619283.

It is an arithmetic number, because the mean of its divisors is an integer number (77857594375183).

Almost surely, 2^{311430224323021} is an apocalyptic number.

It is an amenable number.

311430224323021 is a deficient number, since it is larger than the sum of its proper divisors (153177711).

311430224323021 is a wasteful number, since it uses less digits than its factorization.

311430224323021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153177710.

The product of its (nonzero) digits is 20736, while the sum is 31.

Adding to 311430224323021 its reverse (120323422034113), we get a palindrome (431753646357134).

The spelling of 311430224323021 in words is "three hundred eleven trillion, four hundred thirty billion, two hundred twenty-four million, three hundred twenty-three thousand, twenty-one".