21793379 has 4 divisors (see below), whose sum is σ = 22100400. Its totient is φ = 21486360.

The previous prime is 21793363. The next prime is 21793451. The reversal of 21793379 is 97339712.

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 21793379 - 2⁴ = 21793363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21793319) 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, 153404 + ... + 153545.

It is an arithmetic number, because the mean of its divisors is an integer number (5525100).

Almost surely, 2^21793379 is an apocalyptic number.

21793379 is a deficient number, since it is larger than the sum of its proper divisors (307021).

21793379 is an equidigital number, since it uses as much as digits as its factorization.

21793379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307020.

The product of its digits is 71442, while the sum is 41.

The square root of 21793379 is about 4668.3379269286. The cubic root of 21793379 is about 279.3239600500.

The spelling of 21793379 in words is "twenty-one million, seven hundred ninety-three thousand, three hundred seventy-nine".