21443086523 has 4 divisors (see below), whose sum is σ = 22022629440. Its totient is φ = 20863543608.

The previous prime is 21443086499. The next prime is 21443086529. The reversal of 21443086523 is 32568034412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21443086523 - 2³² = 17148119227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21443086529) 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, 289771403 + ... + 289771476.

It is an arithmetic number, because the mean of its divisors is an integer number (5505657360).

Almost surely, 2^21443086523 is an apocalyptic number.

21443086523 is a deficient number, since it is larger than the sum of its proper divisors (579542917).

21443086523 is an equidigital number, since it uses as much as digits as its factorization.

21443086523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 579542916.

The product of its (nonzero) digits is 138240, while the sum is 38.

The spelling of 21443086523 in words is "twenty-one billion, four hundred forty-three million, eighty-six thousand, five hundred twenty-three".