21358844573 has 16 divisors (see below), whose sum is σ = 23690983680. Its totient is φ = 19092004800.

The previous prime is 21358844561. The next prime is 21358844581. The reversal of 21358844573 is 37544885312.

It is not a de Polignac number, because 21358844573 - 2¹⁶ = 21358779037 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 (21358846573) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3378011 + ... + 3384327.

It is an arithmetic number, because the mean of its divisors is an integer number (1480686480).

Almost surely, 2^21358844573 is an apocalyptic number.

It is an amenable number.

21358844573 is a deficient number, since it is larger than the sum of its proper divisors (2332139107).

21358844573 is a wasteful number, since it uses less digits than its factorization.

21358844573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11428.

The product of its digits is 3225600, while the sum is 50.

The spelling of 21358844573 in words is "twenty-one billion, three hundred fifty-eight million, eight hundred forty-four thousand, five hundred seventy-three".