21944834 has 4 divisors (see below), whose sum is σ = 32917254. Its totient is φ = 10972416.

The previous prime is 21944833. The next prime is 21944837. The reversal of 21944834 is 43844912.

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

It can be written as a sum of positive squares in only one way, i.e., 14938225 + 7006609 = 3865^2 + 2647^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21944794 and 21944803.

It is not an unprimeable number, because it can be changed into a prime (21944833) 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 as a sum of consecutive naturals, namely, 5486207 + ... + 5486210.

Almost surely, 2^21944834 is an apocalyptic number.

21944834 is a deficient number, since it is larger than the sum of its proper divisors (10972420).

21944834 is a wasteful number, since it uses less digits than its factorization.

21944834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10972419.

The product of its digits is 27648, while the sum is 35.

The square root of 21944834 is about 4684.5313532946. The cubic root of 21944834 is about 279.9695289970.

The spelling of 21944834 in words is "twenty-one million, nine hundred forty-four thousand, eight hundred thirty-four".