21075436583 has 4 divisors (see below), whose sum is σ = 21755289408. Its totient is φ = 20395583760.

The previous prime is 21075436531. The next prime is 21075436631. The reversal of 21075436583 is 38563457012.

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 21075436583 - 2¹² = 21075432487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21075432583) 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, 339926366 + ... + 339926427.

It is an arithmetic number, because the mean of its divisors is an integer number (5438822352).

Almost surely, 2^21075436583 is an apocalyptic number.

21075436583 is a deficient number, since it is larger than the sum of its proper divisors (679852825).

21075436583 is an equidigital number, since it uses as much as digits as its factorization.

21075436583 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 679852824.

The product of its (nonzero) digits is 604800, while the sum is 44.

The spelling of 21075436583 in words is "twenty-one billion, seventy-five million, four hundred thirty-six thousand, five hundred eighty-three".