21963950 has 12 divisors (see below), whose sum is σ = 40853040. Its totient is φ = 8785560.

The previous prime is 21963947. The next prime is 21963959. The reversal of 21963950 is 5936912.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21963950.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21963959) 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 5 ways as a sum of consecutive naturals, for example, 219590 + ... + 219689.

It is an arithmetic number, because the mean of its divisors is an integer number (3404420).

Almost surely, 2^21963950 is an apocalyptic number.

21963950 is a deficient number, since it is larger than the sum of its proper divisors (18889090).

21963950 is a wasteful number, since it uses less digits than its factorization.

21963950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439291 (or 439286 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 35.

The square root of 21963950 is about 4686.5712413234. The cubic root of 21963950 is about 280.0507986065.

The spelling of 21963950 in words is "twenty-one million, nine hundred sixty-three thousand, nine hundred fifty".