21703478 has 4 divisors (see below), whose sum is σ = 32555220. Its totient is φ = 10851738.

The previous prime is 21703471. The next prime is 21703483. The reversal of 21703478 is 87430712.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21703471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5425868 + ... + 5425871.

It is an arithmetic number, because the mean of its divisors is an integer number (8138805).

Almost surely, 2^21703478 is an apocalyptic number.

21703478 is a deficient number, since it is larger than the sum of its proper divisors (10851742).

21703478 is a wasteful number, since it uses less digits than its factorization.

21703478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10851741.

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 21703478 is about 4658.6991746624. The cubic root of 21703478 is about 278.9393461072.

The spelling of 21703478 in words is "twenty-one million, seven hundred three thousand, four hundred seventy-eight".