21443963009 has 8 divisors (see below), whose sum is σ = 24508343808. Its totient is φ = 18379821600.

The previous prime is 21443962999. The next prime is 21443963011. The reversal of 21443963009 is 90036934412.

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

It is not a de Polignac number, because 21443963009 - 2⁴ = 21443962993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21443963069) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 218309 + ... + 300909.

It is an arithmetic number, because the mean of its divisors is an integer number (3063542976).

Almost surely, 2^21443963009 is an apocalyptic number.

It is an amenable number.

21443963009 is a deficient number, since it is larger than the sum of its proper divisors (3064380799).

21443963009 is an equidigital number, since it uses as much as digits as its factorization.

21443963009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119695.

The product of its (nonzero) digits is 139968, while the sum is 41.

The spelling of 21443963009 in words is "twenty-one billion, four hundred forty-three million, nine hundred sixty-three thousand, nine".