21963398 has 8 divisors (see below), whose sum is σ = 32974392. Its totient is φ = 10971936.

The previous prime is 21963379. The next prime is 21963433. The reversal of 21963398 is 89336912.

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

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 1640 + ... + 6827.

It is an arithmetic number, because the mean of its divisors is an integer number (4121799).

Almost surely, 2^21963398 is an apocalyptic number.

21963398 is a deficient number, since it is larger than the sum of its proper divisors (11010994).

21963398 is a wasteful number, since it uses less digits than its factorization.

21963398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9766.

The product of its digits is 69984, while the sum is 41.

The square root of 21963398 is about 4686.5123492849. The cubic root of 21963398 is about 280.0484524994.

The spelling of 21963398 in words is "twenty-one million, nine hundred sixty-three thousand, three hundred ninety-eight".