21703135 has 16 divisors (see below), whose sum is σ = 27698112. Its totient is φ = 16268800.

The previous prime is 21703133. The next prime is 21703141. The reversal of 21703135 is 53130712.

It is not a de Polignac number, because 21703135 - 2¹ = 21703133 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 (21703133) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26025 + ... + 26845.

It is an arithmetic number, because the mean of its divisors is an integer number (1731132).

Almost surely, 2^21703135 is an apocalyptic number.

21703135 is a deficient number, since it is larger than the sum of its proper divisors (5994977).

21703135 is a wasteful number, since it uses less digits than its factorization.

21703135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1154.

The product of its (nonzero) digits is 630, while the sum is 22.

The square root of 21703135 is about 4658.6623616656. The cubic root of 21703135 is about 278.9378766545.

Adding to 21703135 its reverse (53130712), we get a palindrome (74833847).

The spelling of 21703135 in words is "twenty-one million, seven hundred three thousand, one hundred thirty-five".