21793001 has 4 divisors (see below), whose sum is σ = 21952212. Its totient is φ = 21633792.

The previous prime is 21792989. The next prime is 21793021. The reversal of 21793001 is 10039712.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16410601 + 5382400 = 4051^2 + 2320^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21793001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21793021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79400 + ... + 79673.

It is an arithmetic number, because the mean of its divisors is an integer number (5488053).

Almost surely, 2^21793001 is an apocalyptic number.

It is an amenable number.

21793001 is a deficient number, since it is larger than the sum of its proper divisors (159211).

21793001 is a wasteful number, since it uses less digits than its factorization.

21793001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159210.

The product of its (nonzero) digits is 378, while the sum is 23.

The square root of 21793001 is about 4668.2974412520. The cubic root of 21793001 is about 279.3223451089.

The spelling of 21793001 in words is "twenty-one million, seven hundred ninety-three thousand, one".