11724489621 has 24 divisors (see below), whose sum is σ = 18270939960. Its totient is φ = 7202077056.

The previous prime is 11724489599. The next prime is 11724489641. The reversal of 11724489621 is 12698442711.

11724489621 is a `hidden beast` number, since 1 + 17 + 2 + 4 + 4 + 8 + 9 + 621 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 85100625 + 11639388996 = 9225^2 + 107886^2 .

It is not a de Polignac number, because 11724489621 - 2¹⁰ = 11724488597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11724489641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24786 + ... + 155123.

It is an arithmetic number, because the mean of its divisors is an integer number (761289165).

Almost surely, 2^11724489621 is an apocalyptic number.

It is an amenable number.

11724489621 is a deficient number, since it is larger than the sum of its proper divisors (6546450339).

11724489621 is a wasteful number, since it uses less digits than its factorization.

11724489621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180485 (or 180482 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The spelling of 11724489621 in words is "eleven billion, seven hundred twenty-four million, four hundred eighty-nine thousand, six hundred twenty-one".