311242021 has 4 divisors (see below), whose sum is σ = 327623200. Its totient is φ = 294860844.

The previous prime is 311241991. The next prime is 311242031. The reversal of 311242021 is 120242113.

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, and also an emirpimes, since its reverse is a distinct semiprime: 120242113 = 7481 ⋅16073.

It is a cyclic number.

It is not a de Polignac number, because 311242021 - 2⁷ = 311241893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 311241986 and 311242004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311242031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8190561 + ... + 8190598.

It is an arithmetic number, because the mean of its divisors is an integer number (81905800).

Almost surely, 2^311242021 is an apocalyptic number.

It is an amenable number.

311242021 is a deficient number, since it is larger than the sum of its proper divisors (16381179).

311242021 is a wasteful number, since it uses less digits than its factorization.

311242021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16381178.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 311242021 is about 17642.0526300088. The cubic root of 311242021 is about 677.6925981213.

Adding to 311242021 its reverse (120242113), we get a palindrome (431484134).

The spelling of 311242021 in words is "three hundred eleven million, two hundred forty-two thousand, twenty-one".