21038664493 has 8 divisors (see below), whose sum is σ = 26230023360. Its totient is φ = 16393764480.

The previous prime is 21038664467. The next prime is 21038664523. The reversal of 21038664493 is 39446683012.

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

It is a cyclic number.

It is not a de Polignac number, because 21038664493 - 2²⁹ = 20501793581 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 (21038664403) 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, 136614628 + ... + 136614781.

It is an arithmetic number, because the mean of its divisors is an integer number (3278752920).

Almost surely, 2^21038664493 is an apocalyptic number.

It is an amenable number.

21038664493 is a deficient number, since it is larger than the sum of its proper divisors (5191358867).

21038664493 is a wasteful number, since it uses less digits than its factorization.

21038664493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273229427.

The product of its (nonzero) digits is 746496, while the sum is 46.

The spelling of 21038664493 in words is "twenty-one billion, thirty-eight million, six hundred sixty-four thousand, four hundred ninety-three".