21200396 has 12 divisors (see below), whose sum is σ = 42400848. Its totient is φ = 9085872.

The previous prime is 21200383. The next prime is 21200401. The reversal of 21200396 is 69300212.

21200396 is an admirable number.

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, 378551 + ... + 378606.

It is an arithmetic number, because the mean of its divisors is an integer number (3533404).

Almost surely, 2^21200396 is an apocalyptic number.

It is an amenable number.

21200396 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21200396 is a wasteful number, since it uses less digits than its factorization.

21200396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 757168 (or 757166 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 21200396 is about 4604.3887759398. The cubic root of 21200396 is about 276.7672239751.

The spelling of 21200396 in words is "twenty-one million, two hundred thousand, three hundred ninety-six".