21944650 has 108 divisors (see below), whose sum is σ = 52384482. Its totient is φ = 6814080.

The previous prime is 21944581. The next prime is 21944651. The reversal of 21944650 is 5644912.

It can be written as a sum of positive squares in 9 ways, for example, as 14161 + 21930489 = 119^2 + 4683^2 .

It is not an unprimeable number, because it can be changed into a prime (21944651) 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 53 ways as a sum of consecutive naturals, for example, 414024 + ... + 414076.

Almost surely, 2^21944650 is an apocalyptic number.

21944650 is an abundant number, since it is smaller than the sum of its proper divisors (30439832).

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

21944650 is a wasteful number, since it uses less digits than its factorization.

21944650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105 (or 80 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 21944650 is about 4684.5117141491. The cubic root of 21944650 is about 279.9687465116.

The spelling of 21944650 in words is "twenty-one million, nine hundred forty-four thousand, six hundred fifty".