8744021921 has 4 divisors (see below), whose sum is σ = 8947371312. Its totient is φ = 8540672532.

The previous prime is 8744021911. The next prime is 8744021947. The reversal of 8744021921 is 1291204478.

It is a happy number.

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 8744021921 - 2⁶ = 8744021857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8744021911) 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, 101674631 + ... + 101674716.

It is an arithmetic number, because the mean of its divisors is an integer number (2236842828).

Almost surely, 2^8744021921 is an apocalyptic number.

It is an amenable number.

8744021921 is a deficient number, since it is larger than the sum of its proper divisors (203349391).

8744021921 is a wasteful number, since it uses less digits than its factorization.

8744021921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203349390.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 8744021921 is about 93509.4750332821. The cubic root of 8744021921 is about 2060.1732597698.

The spelling of 8744021921 in words is "eight billion, seven hundred forty-four million, twenty-one thousand, nine hundred twenty-one".