21900963 has 8 divisors (see below), whose sum is σ = 33372928. Its totient is φ = 12514824.

The previous prime is 21900953. The next prime is 21900997. The reversal of 21900963 is 36900912.

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

It is not a de Polignac number, because 21900963 - 2¹⁰ = 21899939 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21900963.

It is not an unprimeable number, because it can be changed into a prime (21900953) 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 7 ways as a sum of consecutive naturals, for example, 521431 + ... + 521472.

It is an arithmetic number, because the mean of its divisors is an integer number (4171616).

Almost surely, 2^21900963 is an apocalyptic number.

21900963 is a deficient number, since it is larger than the sum of its proper divisors (11471965).

21900963 is a wasteful number, since it uses less digits than its factorization.

21900963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1042913.

The product of its (nonzero) digits is 2916, while the sum is 30.

The square root of 21900963 is about 4679.8464718407. The cubic root of 21900963 is about 279.7828375691.

The spelling of 21900963 in words is "twenty-one million, nine hundred thousand, nine hundred sixty-three".