21794770 has 8 divisors (see below), whose sum is σ = 39230604. Its totient is φ = 8717904.

The previous prime is 21794761. The next prime is 21794779. The reversal of 21794770 is 7749712.

It is an interprime number because it is at equal distance from previous prime (21794761) and next prime (21794779).

It can be written as a sum of positive squares in 2 ways, for example, as 21409129 + 385641 = 4627^2 + 621^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21794779) 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 3 ways as a sum of consecutive naturals, for example, 1089729 + ... + 1089748.

Almost surely, 2^21794770 is an apocalyptic number.

21794770 is a deficient number, since it is larger than the sum of its proper divisors (17435834).

21794770 is a wasteful number, since it uses less digits than its factorization.

21794770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2179484.

The product of its (nonzero) digits is 24696, while the sum is 37.

The square root of 21794770 is about 4668.4869069111. The cubic root of 21794770 is about 279.3299027014.

The spelling of 21794770 in words is "twenty-one million, seven hundred ninety-four thousand, seven hundred seventy".