21700903 has 16 divisors (see below), whose sum is σ = 26153280. Its totient is φ = 17611776.

The previous prime is 21700901. The next prime is 21700949. The reversal of 21700903 is 30900712.

It is not a de Polignac number, because 21700903 - 2¹ = 21700901 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 (21700901) 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 15 ways as a sum of consecutive naturals, for example, 9751 + ... + 11767.

It is an arithmetic number, because the mean of its divisors is an integer number (1634580).

Almost surely, 2^21700903 is an apocalyptic number.

21700903 is a deficient number, since it is larger than the sum of its proper divisors (4452377).

21700903 is a wasteful number, since it uses less digits than its factorization.

21700903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2106.

The product of its (nonzero) digits is 378, while the sum is 22.

The square root of 21700903 is about 4658.4228017646. The cubic root of 21700903 is about 278.9283141238.

The spelling of 21700903 in words is "twenty-one million, seven hundred thousand, nine hundred three".