11604143221 has 4 divisors (see below), whose sum is σ = 12659065344. Its totient is φ = 10549221100.

The previous prime is 11604143219. The next prime is 11604143261. The reversal of 11604143221 is 12234140611.

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 not a de Polignac number, because 11604143221 - 2¹ = 11604143219 is a prime.

It is a super-2 number, since 2×11604143221² (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 (11604143261) 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, 527461045 + ... + 527461066.

It is an arithmetic number, because the mean of its divisors is an integer number (3164766336).

Almost surely, 2^11604143221 is an apocalyptic number.

11604143221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11604143221 is a deficient number, since it is larger than the sum of its proper divisors (1054922123).

11604143221 is a wasteful number, since it uses less digits than its factorization.

11604143221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1054922122.

The product of its (nonzero) digits is 1152, while the sum is 25.

Adding to 11604143221 its reverse (12234140611), we get a palindrome (23838283832).

The spelling of 11604143221 in words is "eleven billion, six hundred four million, one hundred forty-three thousand, two hundred twenty-one".