21703228 has 12 divisors (see below), whose sum is σ = 38019240. Its totient is φ = 10840592.

The previous prime is 21703211. The next prime is 21703229. The reversal of 21703228 is 82230712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21703229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3018 + ... + 7246.

It is an arithmetic number, because the mean of its divisors is an integer number (3168270).

Almost surely, 2^21703228 is an apocalyptic number.

It is an amenable number.

21703228 is a deficient number, since it is larger than the sum of its proper divisors (16316012).

21703228 is a wasteful number, since it uses less digits than its factorization.

21703228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5516 (or 5514 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 21703228 is about 4658.6723430608. The cubic root of 21703228 is about 278.9382750791.

The spelling of 21703228 in words is "twenty-one million, seven hundred three thousand, two hundred twenty-eight".