11594981221 has 4 divisors (see below), whose sum is σ = 11595457312. Its totient is φ = 11594505132.

The previous prime is 11594981197. The next prime is 11594981267. The reversal of 11594981221 is 12218949511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11594981221 - 2²⁷ = 11460763493 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 (11594984221) 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, 199425 + ... + 250918.

It is an arithmetic number, because the mean of its divisors is an integer number (2898864328).

Almost surely, 2^11594981221 is an apocalyptic number.

It is an amenable number.

11594981221 is a deficient number, since it is larger than the sum of its proper divisors (476091).

11594981221 is an equidigital number, since it uses as much as digits as its factorization.

11594981221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476090.

The product of its digits is 51840, while the sum is 43.

The spelling of 11594981221 in words is "eleven billion, five hundred ninety-four million, nine hundred eighty-one thousand, two hundred twenty-one".