311440042023421 has 4 divisors (see below), whose sum is σ = 312564374305372. Its totient is φ = 310315709741472.

The previous prime is 311440042023403. The next prime is 311440042023437. The reversal of 311440042023421 is 124320240044113.

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 31089389517796 + 280350652505625 = 5575786^2 + 16743675^2 .

It is a cyclic number.

It is not a de Polignac number, because 311440042023421 - 2¹⁷ = 311440041892349 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 (311440042024421) 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, 562166140560 + ... + 562166141113.

It is an arithmetic number, because the mean of its divisors is an integer number (78141093576343).

Almost surely, 2^{311440042023421} is an apocalyptic number.

It is an amenable number.

311440042023421 is a deficient number, since it is larger than the sum of its proper divisors (1124332281951).

311440042023421 is a wasteful number, since it uses less digits than its factorization.

311440042023421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1124332281950.

The product of its (nonzero) digits is 18432, while the sum is 31.

Adding to 311440042023421 its reverse (124320240044113), we get a palindrome (435760282067534).

The spelling of 311440042023421 in words is "three hundred eleven trillion, four hundred forty billion, forty-two million, twenty-three thousand, four hundred twenty-one".