21944634 has 8 divisors (see below), whose sum is σ = 43889280. Its totient is φ = 7314876.

The previous prime is 21944581. The next prime is 21944651. The reversal of 21944634 is 43644912.

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

21944634 is an admirable number.

It is a super-2 number, since 2×21944634² = 963133922787912, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21944595 and 21944604.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1828714 + ... + 1828725.

It is an arithmetic number, because the mean of its divisors is an integer number (5486160).

Almost surely, 2^21944634 is an apocalyptic number.

21944634 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21944634 is a wasteful number, since it uses less digits than its factorization.

21944634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3657444.

The product of its digits is 20736, while the sum is 33.

The square root of 21944634 is about 4684.5100063934. The cubic root of 21944634 is about 279.9686784692.

It can be divided in two parts, 21944 and 634, that added together give a triangular number (22578 = T₂₁₂).

The spelling of 21944634 in words is "twenty-one million, nine hundred forty-four thousand, six hundred thirty-four".