111604044521 has 4 divisors (see below), whose sum is σ = 113175932544. Its totient is φ = 110032156500.

The previous prime is 111604044509. The next prime is 111604044551. The reversal of 111604044521 is 125440406111.

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, and also an emirpimes, since its reverse is a distinct semiprime: 125440406111 = 97 ⋅1293200063.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111604044521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111604044551) 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, 785943905 + ... + 785944046.

It is an arithmetic number, because the mean of its divisors is an integer number (28293983136).

Almost surely, 2^111604044521 is an apocalyptic number.

It is an amenable number.

111604044521 is a deficient number, since it is larger than the sum of its proper divisors (1571888023).

111604044521 is an equidigital number, since it uses as much as digits as its factorization.

111604044521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1571888022.

The product of its (nonzero) digits is 3840, while the sum is 29.

The spelling of 111604044521 in words is "one hundred eleven billion, six hundred four million, forty-four thousand, five hundred twenty-one".