21200672 has 24 divisors (see below), whose sum is σ = 42426972. Its totient is φ = 10425600.

The previous prime is 21200639. The next prime is 21200681. The reversal of 21200672 is 27600212.

It can be written as a sum of positive squares in 2 ways, for example, as 18627856 + 2572816 = 4316^2 + 1604^2 .

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, 3479 + ... + 7382.

Almost surely, 2^21200672 is an apocalyptic number.

It is an amenable number.

21200672 is an abundant number, since it is smaller than the sum of its proper divisors (21226300).

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

21200672 is a wasteful number, since it uses less digits than its factorization.

21200672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10932 (or 10924 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 21200672 is about 4604.4187472470. The cubic root of 21200672 is about 276.7684250127.

Adding to 21200672 its reverse (27600212), we get a palindrome (48800884).

The spelling of 21200672 in words is "twenty-one million, two hundred thousand, six hundred seventy-two".