11558577421 has 4 divisors (see below), whose sum is σ = 11716914172. Its totient is φ = 11400240672.

The previous prime is 11558577391. The next prime is 11558577517. The reversal of 11558577421 is 12477585511.

11558577421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 5865874921 + 5692702500 = 76589^2 + 75450^2 .

It is a cyclic number.

It is not a de Polignac number, because 11558577421 - 2¹⁵ = 11558544653 is a prime.

It is a super-2 number, since 2×11558577421² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11558575421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79168266 + ... + 79168411.

It is an arithmetic number, because the mean of its divisors is an integer number (2929228543).

Almost surely, 2^11558577421 is an apocalyptic number.

It is an amenable number.

11558577421 is a deficient number, since it is larger than the sum of its proper divisors (158336751).

11558577421 is an equidigital number, since it uses as much as digits as its factorization.

11558577421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158336750.

The product of its digits is 392000, while the sum is 46.

The spelling of 11558577421 in words is "eleven billion, five hundred fifty-eight million, five hundred seventy-seven thousand, four hundred twenty-one".