21201703 has 12 divisors (see below), whose sum is σ = 23097312. Its totient is φ = 19393920.

The previous prime is 21201689. The next prime is 21201707. The reversal of 21201703 is 30710212.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-21201703 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201707) 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 11 ways as a sum of consecutive naturals, for example, 22818 + ... + 23728.

It is an arithmetic number, because the mean of its divisors is an integer number (1924776).

Almost surely, 2^21201703 is an apocalyptic number.

21201703 is a deficient number, since it is larger than the sum of its proper divisors (1895609).

21201703 is an equidigital number, since it uses as much as digits as its factorization.

21201703 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1002 (or 965 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 21201703 is about 4604.5307035571. The cubic root of 21201703 is about 276.7729114054.

Adding to 21201703 its reverse (30710212), we get a palindrome (51911915).

It can be divided in two parts, 21201 and 703, that added together give a square (21904 = 148²).

The spelling of 21201703 in words is "twenty-one million, two hundred one thousand, seven hundred three".