311231011101021 has 40 divisors (see below), whose sum is σ = 507194939469504. Its totient is φ = 188623493268480.

The previous prime is 311231011101011. The next prime is 311231011101047. The reversal of 311231011101021 is 120101110132113.

311231011101021 is a `hidden beast` number, since 311 + 2 + 310 + 1 + 1 + 10 + 10 + 21 = 666.

It is not a de Polignac number, because 311231011101021 - 2²¹ = 311231009003869 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 311231011100985 and 311231011101003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311231011101011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 129854520 + ... + 132229566.

Almost surely, 2^{311231011101021} is an apocalyptic number.

It is an amenable number.

311231011101021 is a deficient number, since it is larger than the sum of its proper divisors (195963928368483).

311231011101021 is a wasteful number, since it uses less digits than its factorization.

311231011101021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2522143 (or 2522134 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 18.

Adding to 311231011101021 its reverse (120101110132113), we get a palindrome (431332121233134).

The spelling of 311231011101021 in words is "three hundred eleven trillion, two hundred thirty-one billion, eleven million, one hundred one thousand, twenty-one".