21968234 has 8 divisors (see below), whose sum is σ = 32973348. Its totient is φ = 10977120.

The previous prime is 21968209. The next prime is 21968239. The reversal of 21968234 is 43286912.

It can be written as a sum of positive squares in 2 ways, for example, as 21669025 + 299209 = 4655^2 + 547^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 21968194 and 21968203.

It is not an unprimeable number, because it can be changed into a prime (21968239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2444 + ... + 7064.

Almost surely, 2^21968234 is an apocalyptic number.

21968234 is a deficient number, since it is larger than the sum of its proper divisors (11005114).

21968234 is a wasteful number, since it uses less digits than its factorization.

21968234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7000.

The product of its digits is 20736, while the sum is 35.

The square root of 21968234 is about 4687.0282695968. The cubic root of 21968234 is about 280.0690051014.

The spelling of 21968234 in words is "twenty-one million, nine hundred sixty-eight thousand, two hundred thirty-four".