21596963 has 4 divisors (see below), whose sum is σ = 21608160. Its totient is φ = 21585768.

The previous prime is 21596959. The next prime is 21596969. The reversal of 21596963 is 36969512.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21596963 - 2² = 21596959 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 21596963.

It is not an unprimeable number, because it can be changed into a prime (21596969) by changing a digit.

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, 1883 + ... + 6836.

It is an arithmetic number, because the mean of its divisors is an integer number (5402040).

Almost surely, 2^21596963 is an apocalyptic number.

21596963 is a deficient number, since it is larger than the sum of its proper divisors (11197).

21596963 is an equidigital number, since it uses as much as digits as its factorization.

21596963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11196.

The product of its digits is 87480, while the sum is 41.

The square root of 21596963 is about 4647.2532747850. The cubic root of 21596963 is about 278.4822770853.

The spelling of 21596963 in words is "twenty-one million, five hundred ninety-six thousand, nine hundred sixty-three".