21728362 has 8 divisors (see below), whose sum is σ = 34308000. Its totient is φ = 10292364.

The previous prime is 21728347. The next prime is 21728393. The reversal of 21728362 is 26382712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 285862 + ... + 285937.

It is an arithmetic number, because the mean of its divisors is an integer number (4288500).

Almost surely, 2^21728362 is an apocalyptic number.

21728362 is a deficient number, since it is larger than the sum of its proper divisors (12579638).

21728362 is a wasteful number, since it uses less digits than its factorization.

21728362 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571820.

The product of its digits is 8064, while the sum is 31.

The square root of 21728362 is about 4661.3691121815. The cubic root of 21728362 is about 279.0459108339.

The spelling of 21728362 in words is "twenty-one million, seven hundred twenty-eight thousand, three hundred sixty-two".