21045038359 has 4 divisors (see below), whose sum is σ = 21057740704. Its totient is φ = 21032336016.

The previous prime is 21045038351. The next prime is 21045038393. The reversal of 21045038359 is 95383054012.

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 21045038359 - 2³ = 21045038351 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 (21045038351) 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, 6348687 + ... + 6352000.

It is an arithmetic number, because the mean of its divisors is an integer number (5264435176).

Almost surely, 2^21045038359 is an apocalyptic number.

21045038359 is a deficient number, since it is larger than the sum of its proper divisors (12702345).

21045038359 is a wasteful number, since it uses less digits than its factorization.

21045038359 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12702344.

The product of its (nonzero) digits is 129600, while the sum is 40.

The spelling of 21045038359 in words is "twenty-one billion, forty-five million, thirty-eight thousand, three hundred fifty-nine".