21696603 has 8 divisors (see below), whose sum is σ = 28953600. Its totient is φ = 14452008.

The previous prime is 21696599. The next prime is 21696617. The reversal of 21696603 is 30669612.

It is a happy number.

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

It is not a de Polignac number, because 21696603 - 2² = 21696599 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21696203) 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 7 ways as a sum of consecutive naturals, for example, 2358 + ... + 6996.

It is an arithmetic number, because the mean of its divisors is an integer number (3619200).

Almost surely, 2^21696603 is an apocalyptic number.

21696603 is a deficient number, since it is larger than the sum of its proper divisors (7256997).

21696603 is a wasteful number, since it uses less digits than its factorization.

21696603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6201.

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 21696603 is about 4657.9612493021. The cubic root of 21696603 is about 278.9098898371.

The spelling of 21696603 in words is "twenty-one million, six hundred ninety-six thousand, six hundred three".