311120011021 has 4 divisors (see below), whose sum is σ = 311205557692. Its totient is φ = 311034464352.

The previous prime is 311120011019. The next prime is 311120011031. The reversal of 311120011021 is 120110021113.

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 13691574121 + 297428436900 = 117011^2 + 545370^2 .

It is a cyclic number.

It is not a de Polignac number, because 311120011021 - 2¹ = 311120011019 is a prime.

It is a super-2 number, since 2×311120011021² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 311120010992 and 311120011010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311120011001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42767880 + ... + 42775153.

It is an arithmetic number, because the mean of its divisors is an integer number (77801389423).

Almost surely, 2^311120011021 is an apocalyptic number.

It is an amenable number.

311120011021 is a deficient number, since it is larger than the sum of its proper divisors (85546671).

311120011021 is an equidigital number, since it uses as much as digits as its factorization.

311120011021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85546670.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 311120011021 its reverse (120110021113), we get a palindrome (431230032134).

The spelling of 311120011021 in words is "three hundred eleven billion, one hundred twenty million, eleven thousand, twenty-one".