11311003021 has 4 divisors (see below), whose sum is σ = 11320329052. Its totient is φ = 11301676992.

The previous prime is 11311003013. The next prime is 11311003027. The reversal of 11311003021 is 12030011311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12030011311 = 31 ⋅388064881.

It can be written as a sum of positive squares in 2 ways, for example, as 1591212100 + 9719790921 = 39890^2 + 98589^2 .

It is a cyclic number.

It is not a de Polignac number, because 11311003021 - 2³ = 11311003013 is a prime.

It is a super-2 number, since 2×11311003021² (a number of 21 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 = 11311002992 and 11311003010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11311003027) 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, 4661196 + ... + 4663621.

It is an arithmetic number, because the mean of its divisors is an integer number (2830082263).

Almost surely, 2^11311003021 is an apocalyptic number.

It is an amenable number.

11311003021 is a deficient number, since it is larger than the sum of its proper divisors (9326031).

11311003021 is an equidigital number, since it uses as much as digits as its factorization.

11311003021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9326030.

The product of its (nonzero) digits is 18, while the sum is 13.

Adding to 11311003021 its reverse (12030011311), we get a palindrome (23341014332).

The spelling of 11311003021 in words is "eleven billion, three hundred eleven million, three thousand, twenty-one".