21201328 has 10 divisors (see below), whose sum is σ = 41077604. Its totient is φ = 10600656.

The previous prime is 21201311. The next prime is 21201347. The reversal of 21201328 is 82310212.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 662526 + ... + 662557.

Almost surely, 2^21201328 is an apocalyptic number.

It is an amenable number.

21201328 is a deficient number, since it is larger than the sum of its proper divisors (19876276).

21201328 is a wasteful number, since it uses less digits than its factorization.

21201328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1325091 (or 1325085 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 21201328 is about 4604.4899826148. The cubic root of 21201328 is about 276.7712796111.

The spelling of 21201328 in words is "twenty-one million, two hundred one thousand, three hundred twenty-eight".