11552000021 has 4 divisors (see below), whose sum is σ = 12231529452. Its totient is φ = 10872470592.

The previous prime is 11551999997. The next prime is 11552000023. The reversal of 11552000021 is 12000025511.

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 4636248100 + 6915751921 = 68090^2 + 83161^2 .

It is a cyclic number.

It is not a de Polignac number, because 11552000021 - 2⁶ = 11551999957 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 679529413 = 11552000021 / (1 + 1 + 5 + 5 + 2 + 0 + 0 + 0 + 0 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11552000023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 339764690 + ... + 339764723.

It is an arithmetic number, because the mean of its divisors is an integer number (3057882363).

Almost surely, 2^11552000021 is an apocalyptic number.

It is an amenable number.

11552000021 is a deficient number, since it is larger than the sum of its proper divisors (679529431).

11552000021 is an equidigital number, since it uses as much as digits as its factorization.

11552000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 679529430.

The product of its (nonzero) digits is 100, while the sum is 17.

Adding to 11552000021 its reverse (12000025511), we get a palindrome (23552025532).

The spelling of 11552000021 in words is "eleven billion, five hundred fifty-two million, twenty-one", and thus it is an aban number.