11571052021 has 8 divisors (see below), whose sum is σ = 11856650904. Its totient is φ = 11285614080.

The previous prime is 11571052007. The next prime is 11571052049. The reversal of 11571052021 is 12025017511.

It can be written as a sum of positive squares in 4 ways, for example, as 39513796 + 11531538225 = 6286^2 + 107385^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11571052021 - 2¹⁹ = 11570527733 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 (11571052721) 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 7 ways as a sum of consecutive naturals, for example, 112381 + ... + 189133.

It is an arithmetic number, because the mean of its divisors is an integer number (1482081363).

Almost surely, 2^11571052021 is an apocalyptic number.

It is an amenable number.

11571052021 is a deficient number, since it is larger than the sum of its proper divisors (285598883).

11571052021 is an equidigital number, since it uses as much as digits as its factorization.

11571052021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80471.

The product of its (nonzero) digits is 700, while the sum is 25.

Adding to 11571052021 its reverse (12025017511), we get a palindrome (23596069532).

The spelling of 11571052021 in words is "eleven billion, five hundred seventy-one million, fifty-two thousand, twenty-one".