11112131320021 has 4 divisors (see below), whose sum is σ = 11112146531500. Its totient is φ = 11112116108544.

The previous prime is 11112131320007. The next prime is 11112131320067. The reversal of 11112131320021 is 12002313121111.

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 5418252465796 + 5693878854225 = 2327714^2 + 2386185^2 .

It is a cyclic number.

It is not a de Polignac number, because 11112131320021 - 2³⁷ = 10974692366549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11112131320091) 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, 6451596 + ... + 7990453.

It is an arithmetic number, because the mean of its divisors is an integer number (2778036632875).

Almost surely, 2^{11112131320021} is an apocalyptic number.

It is an amenable number.

11112131320021 is a deficient number, since it is larger than the sum of its proper divisors (15211479).

11112131320021 is an equidigital number, since it uses as much as digits as its factorization.

11112131320021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15211478.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 11112131320021 its reverse (12002313121111), we get a palindrome (23114444441132).

The spelling of 11112131320021 in words is "eleven trillion, one hundred twelve billion, one hundred thirty-one million, three hundred twenty thousand, twenty-one".