21026793 has 8 divisors (see below), whose sum is σ = 28138048. Its totient is φ = 13966704.

The previous prime is 21026779. The next prime is 21026801. The reversal of 21026793 is 39762012.

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

It is not a de Polignac number, because 21026793 - 2⁴ = 21026777 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21026793.

It is not an unprimeable number, because it can be changed into a prime (21024793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11821 + ... + 13482.

It is an arithmetic number, because the mean of its divisors is an integer number (3517256).

Almost surely, 2^21026793 is an apocalyptic number.

It is an amenable number.

21026793 is a deficient number, since it is larger than the sum of its proper divisors (7111255).

21026793 is a wasteful number, since it uses less digits than its factorization.

21026793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25583.

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 21026793 is about 4585.4981190706. The cubic root of 21026793 is about 276.0097008773.

The spelling of 21026793 in words is "twenty-one million, twenty-six thousand, seven hundred ninety-three".