10311121021 has 4 divisors (see below), whose sum is σ = 10338043392. Its totient is φ = 10284198652.

The previous prime is 10311120947. The next prime is 10311121033. The reversal of 10311121021 is 12012111301.

It is a happy number.

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: 12012111301 = 263 ⋅45673427.

It is a cyclic number.

It is not a de Polignac number, because 10311121021 - 2²¹ = 10309023869 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10311120992 and 10311121010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10311121081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13460611 + ... + 13461376.

It is an arithmetic number, because the mean of its divisors is an integer number (2584510848).

Almost surely, 2^10311121021 is an apocalyptic number.

It is an amenable number.

10311121021 is a deficient number, since it is larger than the sum of its proper divisors (26922371).

10311121021 is an equidigital number, since it uses as much as digits as its factorization.

10311121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26922370.

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

Adding to 10311121021 its reverse (12012111301), we get a palindrome (22323232322).

The spelling of 10311121021 in words is "ten billion, three hundred eleven million, one hundred twenty-one thousand, twenty-one".