11310520021 has 4 divisors (see below), whose sum is σ = 11495938444. Its totient is φ = 11125101600.

The previous prime is 11310519989. The next prime is 11310520033. The reversal of 11310520021 is 12002501311.

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 681940996 + 10628579025 = 26114^2 + 103095^2 .

It is a cyclic number.

It is not a de Polignac number, because 11310520021 - 2⁵ = 11310519989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11310519977 and 11310520004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11310526021) 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, 92709120 + ... + 92709241.

It is an arithmetic number, because the mean of its divisors is an integer number (2873984611).

Almost surely, 2^11310520021 is an apocalyptic number.

It is an amenable number.

11310520021 is a deficient number, since it is larger than the sum of its proper divisors (185418423).

11310520021 is an equidigital number, since it uses as much as digits as its factorization.

11310520021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185418422.

The product of its (nonzero) digits is 60, while the sum is 16.

The spelling of 11310520021 in words is "eleven billion, three hundred ten million, five hundred twenty thousand, twenty-one".