10311110021 has 4 divisors (see below), whose sum is σ = 10311498444. Its totient is φ = 10310721600.

The previous prime is 10311110009. The next prime is 10311110023. The reversal of 10311110021 is 12001111301.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12001111301 = 4621 ⋅2597081.

It can be written as a sum of positive squares in 2 ways, for example, as 8411457796 + 1899652225 = 91714^2 + 43585^2 .

It is a cyclic number.

It is not a de Polignac number, because 10311110021 - 2⁶ = 10311109957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10311109984 and 10311110011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10311110023) 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, 151220 + ... + 208541.

It is an arithmetic number, because the mean of its divisors is an integer number (2577874611).

Almost surely, 2^10311110021 is an apocalyptic number.

It is an amenable number.

10311110021 is a deficient number, since it is larger than the sum of its proper divisors (388423).

10311110021 is an equidigital number, since it uses as much as digits as its factorization.

10311110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388422.

The product of its (nonzero) digits is 6, while the sum is 11.

Adding to 10311110021 its reverse (12001111301), we get a palindrome (22312221322).

The spelling of 10311110021 in words is "ten billion, three hundred eleven million, one hundred ten thousand, twenty-one".