11563749421 has 8 divisors (see below), whose sum is σ = 13227704064. Its totient is φ = 9902792400.

The previous prime is 11563749419. The next prime is 11563749473. The reversal of 11563749421 is 12494736511.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 11563749421 - 2¹ = 11563749419 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 (11563749221) 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 7 ways as a sum of consecutive naturals, for example, 741130 + ... + 756571.

It is an arithmetic number, because the mean of its divisors is an integer number (1653463008).

Almost surely, 2^11563749421 is an apocalyptic number.

It is an amenable number.

11563749421 is a deficient number, since it is larger than the sum of its proper divisors (1663954643).

11563749421 is a wasteful number, since it uses less digits than its factorization.

11563749421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1498811.

The product of its digits is 181440, while the sum is 43.

The spelling of 11563749421 in words is "eleven billion, five hundred sixty-three million, seven hundred forty-nine thousand, four hundred twenty-one".