21700603 has 16 divisors (see below), whose sum is σ = 23738400. Its totient is φ = 19768320.

The previous prime is 21700597. The next prime is 21700621. The reversal of 21700603 is 30600712.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21700603 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21700643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69175 + ... + 69487.

It is an arithmetic number, because the mean of its divisors is an integer number (1483650).

Almost surely, 2^21700603 is an apocalyptic number.

21700603 is a deficient number, since it is larger than the sum of its proper divisors (2037797).

21700603 is a wasteful number, since it uses less digits than its factorization.

21700603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462.

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 21700603 is about 4658.3906019139. The cubic root of 21700603 is about 278.9270287875.

The spelling of 21700603 in words is "twenty-one million, seven hundred thousand, six hundred three".